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The ISO by Castle

3.5 star property
Beachfront, with outdoor pool

Choose dates to view prices

Photo gallery for The ISO by Castle

Outdoor pool
Beach House Suite (2nd floor, stair access only) | Beach/ocean view
Beach House Suite (2nd floor, stair access only) | Balcony view
One Bedroom Ocean View (2nd Floor, stair access only) | Living room | 42-inch flat-screen TV with cable channels, TV
One Bedroom Ocean View (2nd Floor, stair access only) | Private kitchenette | Fridge, coffee/tea maker
Travelers find their rhythm at The ISO by Castle, where the white sand beach extends the resort. Snorkeling is at guests' doorstep, the outdoor pool offers a refreshing alternative, bike rentals ease coastal exploration, and the water dispenser keeps everyone hydrated.

Reviews

8.4 out of 10
Very good

Popular amenities

  • Bar
  • Air conditioning
The current price is ￥40,879
￥53,456 total
includes taxes & fees
Oct 19 - Oct 20

Room options

Check availability for these dates

Tonight
Oct 1 - Oct 2
Check availability for tonight Oct 1 - Oct 2
Tomorrow
Oct 2 - Oct 3
Check availability for tomorrow Oct 2 - Oct 3
Available filters for rooms
Showing 7 of 7 rooms

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

1 bedroom, laptop workspace, blackout drapes, Internet

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

8.6 out of 10
Excellent
(63 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 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) | 1 bedroom, laptop workspace, blackout drapes, Internet

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

7.8 out of 10
Good
(30 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 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 | 42-inch flat-screen TV with cable channels, TV

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

7.8 out of 10
Good
(14 reviews)

Highlights

Balcony
Separate sitting area
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
  • 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 | Fridge, coffee/tea maker

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

9.0 out of 10
Wonderful
(2 reviews)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchenette
Refrigerator
Flat-screen TV
  • 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 | 42-inch flat-screen TV with cable channels, TV

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

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Separate dining area
Separate sitting area
Air conditioning
Free cribs/infant beds
Kitchen
Refrigerator
Dishwasher
  • 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
(5 reviews)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 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) | 1 bedroom, laptop workspace, blackout drapes, Internet

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

10.0 out of 10
Exceptional
(1 review)

Highlights

Balcony
Air conditioning
Free cribs/infant beds
Refrigerator
Flat-screen TV
Separate bedroom
Ceiling fan
Blackout drapes/curtains
  • 27 sq m
  • Ocean view
  • Sleeps 3
  • 1 King Bed
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About the neighborhood

Located on the beach, The ISO by Castle is in Waipouli, a neighborhood in Kapaa. Holoholoku Heiau and Hikinaakala Heiau are local landmarks, and travelers looking to shop may want to visit Coconut Marketplace and Kapaa Shopping Center. Smith's Tropical Paradise and Lydgate Beach are also worth visiting. Spend some time exploring the area's activities, including golfing.
Visit our Kapaa travel guideOpens in a new window
View more Resorts in KapaaOpens in a new window
Map
96746, HI, Kapaa, 4-796 Kuhio Hwy

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 - 4 min drive - 2.6 km
  • Smith's Tropical Paradise - 6 min drive - 3.0 km

Getting around

  • Lihue Airport (LIH) - 14 min drive

Restaurants

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

About this property

The ISO by Castle

Resort located in Waipouli
Take advantage of a garden, a bar, and a restaurant at The ISO by Castle. This resort is a great place to bask in the sun with a beachfront location, beachfront dining, and snorkeling.
Other perks at this resort include:
  • An outdoor pool
  • Bike rentals, smoke-free premises, and a water dispenser
  • Guest reviews speak highly of the beach locale, pool, and helpful staff
Room features
All 78 rooms have comforts such as laptop-friendly workspaces and air conditioning, as well as thoughtful touches like high-speed internet. Guest reviews speak positively of the clean rooms at the property.
Other conveniences in all rooms include:
  • Bathrooms with shower/tub combinations and free toiletries
  • 42-inch flat-screen TVs with cable channels
  • Wardrobes/closets, balconies, and refrigerators

Similar properties

Balcony

Aston Islander on the Beach

  • Pool
  • Air conditioning
  • Bar
  • Laundry
8.6 out of 10, Excellent, 1,006 reviews
The price is ￥28,805
￥38,691 total
includes taxes & fees
Oct 21 - Oct 22
Aston Islander on the Beach

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
  • Snorkeling
  • Yoga classes

Family friendly

  • In-room refrigerator
  • Outdoor pool

Conveniences

  • Limited-hour front desk
  • Water dispenser

Outdoors

  • Garden
  • On the beach

Accessibility

  • No elevator

More

  • 3 floors
  • 5 buildings
  • Smoking not allowed
  • 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

Property 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

Frequently asked questions

Does The ISO by Castle have a pool?

Yes, this property has an outdoor pool.

How much does it cost to stay at The ISO by Castle?

As of Oct 1, 2025, prices found for a 1-night stay for 2 adults at The ISO by Castle on Oct 19, 2025 start from ￥40,879, excluding taxes and fees. This price is based on the lowest nightly price found in the last 24 hours for stays in the next 30 days. Prices are subject to change. Choose your dates for more accurate prices.

Is The ISO by Castle pet-friendly?

No, pets are not allowed at this property.

What time is check-in at The ISO by Castle?

Check-in start time: 3:00 PM; Check-in end time: 10:00 PM.

What time is check-out at The ISO by Castle?

Check-out is at 11 AM. Late check-out is available for a fee (subject to availability).

Where is The ISO by Castle located?

Nestled on the beach, this Waipouli resort is within 1 mi (2 km) of Waipouli Beach, Fuji Beach, and Lae Nani Beach. Coconut Marketplace and Kapaa Shopping Center are also within 1 mi (2 km).

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