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The ISO by Castle

3.5 star property

Photo gallery for The ISO by Castle

Outdoor pool
One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette
One Bedroom Ocean View (2nd Floor, stair access only) | Living room
Beach House Suite (2nd floor, stair access only) | Balcony view
Beach House Suite (2nd floor, stair access only) | Beach/ocean view

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning

Explore the area

View map
4-796 Kuhio Hwy, Kapaa, HI, 96746
  • Place, Waipouli Beach
    ‪3 min walk‬
  • Place, Coconut Marketplace
    ‪14 min walk‬
  • Place, Lae Nani Beach
    ‪3 min drive‬
  • Airport, Lihue, HI (LIH)
    ‪13 min drive‬

Room options

View all photos for Ocean View (1st - 3rd Upper Floors, stair access only

1 bedroom, laptop workspace, blackout curtains, Internet

Ocean View (1st - 3rd Upper Floors, stair access only

8.6 out of 10
Excellent
(63 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only)

Ocean Front View (1st - 3rd Upper Floors, stair access only)

7.8 out of 10
Good
(30 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Deluxe Room, Ocean View (2nd Floor - stair access only)

Deluxe Room, Ocean View (2nd Floor - stair access only) | Living area

Deluxe Room, Ocean View (2nd Floor - stair access only)

7.8 out of 10
Good
(14 reviews)
  • 27 sq m
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed OR 2 Double Beds

View all photos for One Bedroom Ocean View (2nd Floor, stair access only)

One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette

One Bedroom Ocean View (2nd Floor, stair access only)

9.0 out of 10
Wonderful
(2 reviews)
  • 54 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Double Sofa Bed

View all photos for Beach House Suite (2nd floor, stair access only)

Beach House Suite (2nd floor, stair access only) | Living area

Beach House Suite (2nd floor, stair access only)

10.0 out of 10
Exceptional
(1 review)
  • 59 sq m
  • 1 bedroom
  • Ocean view
  • Sleeps 4
  • 1 King Bed and 1 Queen Sofa Bed

View all photos for Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only) | View from room

Partial Ocean/Pool View (1st - 2nd Upper Floors, stair access only)

9.6 out of 10
Exceptional
(7 reviews)
  • 27 sq m
  • Partial ocean view
  • Sleeps 3
  • 2 Double Beds OR 1 King Bed

View all photos for Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

Premium Ocean Front View (1st - 3rd Upper Floors, stair access only)

10.0 out of 10
Exceptional
(1 review)
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 1 King Bed

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About the area

Kapaa

Located in Kapaa (Waipouli), The ISO by Castle is within a 5-minute drive of Waipouli Beach and Coconut Marketplace. .This beach resort is 8.5 mi (13.8 km) from Nawiliwili Harbor and 0.9 mi (1.4 km) from Fuji Beach.
View more Resorts in KapaaOpens in a new window

What's nearby

  • Waipouli Beach - 3 min walk - 0.3 km
  • Coconut Marketplace - 14 min walk - 1.2 km
  • Lae Nani Beach - 3 min drive - 1.5 km
  • Kapa'a Beach Park - 3 min drive - 2.6 km
  • Smith's Tropical Paradise - 5 min drive - 3.0 km

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

  • ‪McDonald's - ‬4 min walk
  • ‪Starbucks - ‬6 min walk
  • ‪Sensei Sushi Bar And Grill - ‬14 min walk
  • ‪Waipouli Deli & Restaurant - ‬3 min walk
  • ‪JoJo’s Shave Ice - ‬15 min walk

About this property

The ISO by Castle

Beach resort with an outdoor pool and a restaurant
The ISO by Castle offers 78 air-conditioned accommodations with complimentary toiletries and ceiling fans. Rooms open to balconies. 42-inch flat-screen televisions come with cable channels. Guests can make use of the in-room refrigerators and coffee/tea makers. Bathrooms include shower/tub combinations.
Recreational amenities at the resort include an outdoor pool.

The recreational activities listed below are available either on site or nearby; fees may apply.

Make yourself at home in one of the 78 air-conditioned rooms featuring refrigerators and flat-screen televisions. Rooms have private balconies. Cable television is provided for your entertainment. Bathrooms have shower/tub combinations and complimentary toiletries.
Be sure to enjoy recreational amenities including an outdoor pool and bicycles to rent.
Enjoy local cuisine at The Bullshed Restaurant, a beachfront restaurant which features a bar/lounge.
The front desk is staffed during limited hours.
The Bullshed Restaurant - This beachfront restaurant specializes in local cuisine and serves dinner only. Guests can enjoy drinks at the bar.

Property amenities

Internet

  • Available in all rooms: High-speed internet

Food and drink

  • A bar/lounge
  • A restaurant

Restaurants on site

  • The Bullshed Restaurant

Things to do

  • Bicycle rentals
  • Outdoor pool
  • Snorkelling
  • Yoga classes

Family friendly

  • In-room refrigerator
  • Outdoor pool

Conveniences

  • Limited-hour front desk
  • Water dispenser

Outdoors

  • Garden
  • On the beach

Accessibility

  • No lift

More

  • 3 floors
  • 5 buildings
  • Smoke-free property
  • Water dispenser usage encouraged

Room amenities

Bedroom

  • Bedsheets provided
  • Blackout drapes

Bathroom

  • Free toiletries
  • Private bathroom
  • Shower/bathtub combination
  • Towels provided

Entertainment

  • 42-inch flat-screen TV with cable channels

Food and drink

  • Coffee/tea maker
  • Refrigerator

More

  • Air conditioning
  • Ceiling fan
  • Laptop workspace

Policies

Check-in

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM
Minimum check-in age: 18

Check-out

Check-out before 11 AM
Late check-out subject to availability
A late check-out fee will be charged

Special check-in instructions

The front desk is open daily from 7:00 AM - 10:00 PM
Front desk staffed during limited hours

Access methods

Front desk (limited hours)

Pets

Pets not allowed

Children and extra beds

Children are welcome
Rollaway/extra beds are not available

Payment types

Important information

Fees

You'll be asked to pay the following charges at the property. Fees may include applicable taxes:

  • Resort fee: USD 35.38 per accommodation, per night
The resort fee includes:
  • Additional inclusions
  • Fitness/yoga classes
  • Newspaper
  • Parking
  • Self parking
  • WiFi access (may be limited)

We have included all charges provided to us by the property.

Optional extras

  • Late check-out is available for a fee (subject to availability)

The above list may not be comprehensive. Fees and deposits may not include tax and are subject to change.

You need to know

Extra-person charges may apply and vary depending on property policy
Government-issued photo identification and a credit card, debit card, or cash deposit may be required at check-in for incidental charges
Special requests are subject to availability upon check-in and may incur additional charges; special requests cannot be guaranteed
Tax ID - W-34434930-01
This property accepts credit cards and debit cards; cash is not accepted
Safety features at this property include a smoke detector
This property has outdoor spaces, such as balconies, patios, terraces which may not be suitable for children; if you have concerns, we recommend contacting the property prior to your arrival to confirm they can accommodate you in a suitable room

We should mention

This property does not have elevators
Only registered guests are allowed in the guestrooms

Property is also known as

Castle Mokihana
Castle Mokihana Hotel
Castle Mokihana Hotel Kapaa
Castle Mokihana Kapaa
Mokihana Of Kauai Hotel Kapaa
ISO. Island. Sky. Ocean. Resort Kapaa
ISO. Island. Sky. Ocean. Resort
ISO. Island. Sky. Ocean. Kapaa
ISO. Island. Sky. Ocean.
ISO Sky Ocean Resort Kapaa
The ISO by Castle Kapaa
The ISO by Castle Resort
The ISO. Island. Sky. Ocean.
The ISO by Castle Resort Kapaa

The ISO by Castle Reviews

Reviews

8.4

Very good

Rating 10 - Excellent. 482 out of 1003 reviews
Rating 8 - Good. 329 out of 1003 reviews
Rating 6 - Okay. 121 out of 1003 reviews
Rating 4 - Poor. 41 out of 1003 reviews
Rating 2 - Terrible. 30 out of 1003 reviews

8.8/10

Cleanliness

8.4/10

Staff & service

8.0/10

Amenities

8.2/10

Property conditions & facilities

8.4/10

Eco-friendliness

Reviews

10/10 Excellent

James

Liked: Cleanliness, staff & service, property conditions & facilities
Good but the restaurant attached was not the best
Stayed 3 nights in Aug 2025

6/10 Okay

Marion

Liked: Cleanliness, room comfort

Correct pour le prix, bien placé + parking gratuit

Nous étions au rez-de-chaussée avec une vue sur la piscine. Le petit déjeuner, n'était pas du tout ce quoi nous nous attendions, muffin, lait au chocolat en briquette. Le café/thé devait se faire directement dans la chambre. La chambre en elle-même était correct. Mais nous étions vraiment bien placé et point bonus le parking était gratuit.
Stayed 4 nights in Jul 2025

10/10 Excellent

Samantha

Travelled with partner
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Really loved views of the ocean suite, nice grounds & beach next door was never busy. As others mentioned, our King reservation was not guaranteed so we almost ended up in a double. Be sure to call ahead & confirm what you expect. No coffee in the lobby available, not even during the grab & go breakfast. Small in-room pot only. Nice perks of sunrise yoga, and having bikes for use as long as one is available that is your size since the seats don't adjust. East parking. Great spot to explore Kauai by car, would stay here again!
Stayed 4 nights in Jul 2025

8/10 Good

Andrea

Liked: Cleanliness, staff & service, property conditions & facilities
We only stayed here a short time, but the rooms were clean and functional. The pool is nice for lounging. You can get free bikes in the lobby; the hotel is near Ke Ala Hele Makalae Path, so it is really easy to go for a bike ride along the coast with your family. The hotel has a sea wall so you can't get into the ocean right in front of the hotel, but you can access the beach and walk on the sand at the two neighboring resorts.
Stayed 2 nights in Aug 2025

6/10 Okay

Elizabeth

Travelled with family
Liked: Staff & service
Disliked: Cleanliness, property conditions & facilities, room comfort

Great location but dated.

The pros: great location - could not be closer to the ocean. Sound of the waves at night was awesome. Friendly staff and nice paths to walk. Cons: dated rooms with a musty smell. Not much space and the outside needed some updates. Parking is cramped.
Stayed 4 nights in Jul 2025

6/10 Okay

Jodie, Los Angeles

Travelled with partner, Travelled with group
Liked: Cleanliness, staff & service
Pros: Overlooking the beach. We had a pretty nice view for a decent price. There’s breakfast but it’s just cereal, muffins, apples .. can’t complain since it’s free but wish there were more options. Cons: AC wasn’t blowing cold at all. Checked into a very warm room. Outdated bathroom. Walk-up building only. Uncovered parking. FYI: Very low ceiling / ceiling fan so taller people have to be careful. Our friend whacked his hand pretty hard on it just stretching lol.
Stayed 3 nights in Jul 2025

4/10 Poor

Rommel

Travelled with partner
Disliked: Cleanliness, staff & service, amenities, property conditions & facilities
Very nice location which is walking distance to good reasonable food. Property is very outdated. Not sure why they are called a “resort”. I think it is a stretch in able to ask for the resort fee. Nothing fancy here. If your goal is just to sleep for the night, then it is fine. But if you are after going to the beach, then you are in the wrong place. The beach here is not where you can swim. It is just for the view.
Stayed 6 nights in Jul 2025

6/10 Okay

Brody David

Liked: Cleanliness, staff & service, property conditions & facilities
Stayed 6 nights in Jul 2025

6/10 Okay

Al

Travelled with partner
Liked: Cleanliness, staff & service, amenities
I like the property it’s close to a beach and nice views and if you want, you could just swim in the pool. Too bad there wasn’t a jacuzzi, but it wasn’t a deal breaker. The room was okay, the bed was comfortable and the room was clean. The restaurant on premises was great! The hotel was close to shopping and places to eat. All in all, it was a great place to stay!
Stayed 2 nights in Jul 2025

8/10 Good

Rachel

Travelled with partner
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
Overall a positive experience! Comfortable room with beautiful ocean view. Plenty of space for two people, comfortable bed, and we had everything we needed. The area is a bit more commercial but that does come with the convenience of grocery stores and tons of restaurant options. Only downsides were that we were unable to drop off our luggage early and there was somewhat of a mildew smell and mold in the bathroom. Unfortunately this is fairly common is ocean side hotels so not a deal breaker.
Stayed 2 nights in Jul 2025

4/10 Poor

Clifford

Disliked: Cleanliness, staff & service, property conditions & facilities
Musty smell in the room. Pillow case smelled as if it wasn't changed. Pictures of the place deceivingly look good. But nothing like it in person. The place looks old. But have to admit price is good, and a good location as a base to visit the north, south and west.
Stayed 6 nights in Jul 2025

10/10 Excellent

Mengqing

Liked: Cleanliness, staff & service, amenities, property conditions & facilities
It's a very good safe place to stay.
Stayed 4 nights in Jul 2025

8/10 Good

CHUNMEI XIE VAN

Travelled with family
Liked: Cleanliness, staff & service, amenities, property conditions & facilities
The staff were very friendly and very accommodating to make our stay enjoyable. Our room was quite comfortable with a kitchen and separate bedroom although there were a few areas needing minor repair and painting.
Stayed 7 nights in Jul 2025

8/10 Good

Cynthia

Liked: Cleanliness, staff & service
Older establishment but very clean, great view and good restaurant nearby. Only couple of blocks from coconut market. Gave you privacy only tidied your room upon request. Affordable.
View from our room.
Stayed 7 nights in Jul 2025

10/10 Excellent

kurt

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Stayed 3 nights in Jul 2025

10/10 Excellent

Wallace

Travelled with family
Liked: Staff & service, property conditions & facilities
Disliked: Room comfort

Property is a good location very Central

Staff is extremely friendly & knowledgeable one AC did not work & second room. AC was adequate, but could’ve been a little colder. property was in good shape
Stayed 7 nights in Jul 2025

10/10 Excellent

Kiarah

Liked: Cleanliness, staff & service, property conditions & facilities, room comfort
Had a lot of amenities like a nice grab and go breakfast as well as bikes you could rent out. They also did morning yoga and had a great pool.
Stayed 2 nights in Jul 2025

6/10 Okay

Paul

Disliked: Property conditions & facilities

Location good hotel very average

Somewhat remodeled hotel, not a resort. Do not bring your kids no beach and beach swimming. Located on water but unable to swim due to rocks and break. AC needs upgrade and was there for three days and was offered no housekeeping service. Was handed towels and they never came to room to ask if I needed service. Very very poorly done. For the price I would look at other options.
Stayed 1 night in Jul 2025

8/10 Good

Paul

Liked: Cleanliness, staff & service
Great location nice restaurant attached to Hotel. No beach for swimming though but very nice location on the water. Nice pool very quiet location.
Stayed 2 nights in Jul 2025

10/10 Excellent

Raul

Stayed 6 nights in Jul 2025

10/10 Excellent

KIANAMALIA

Stayed 2 nights in Jul 2025

6/10 Okay

Malcolm

Liked: Staff & service
The property is just old and the rooms are very small for two non married people even though they had two beds. They try hard to keep it clean but remodeling is necessary. All in all it was a good stay
Stayed 14 nights in Jun 2025

8/10 Good

Donna

Travelled with partner
Liked: Cleanliness, amenities, property conditions & facilities
Great location, bikes were nice for the bike path, breakfast,grab and go was helpful.. property was older but well kept.
Stayed 4 nights in Jul 2025

10/10 Excellent

Antoinette

Stayed 4 nights in Jul 2025

10/10 Excellent

Steve

Travelled with group
Liked: Cleanliness, amenities, property conditions & facilities
Nothing to dislike like about the stay. Will recommend for friends for certain who want to visit Kauai. Experience was amazing, along with the staff.
Stayed 2 nights in Jul 2025