The ISO

The ISO The ISO is a private, oceanfront retreat that welcomes guests home after a day of discovery and adventure on the majestic island of Kauai.

It is a place of rest, relaxation and rejuvenation.

Where the land meets the sea, and every stay feels like a breath of Kauaʻi. 🌺✨
07/11/2025

Where the land meets the sea, and every stay feels like a breath of Kauaʻi. 🌺✨

Your island reset starts here. 🌞
25/10/2025

Your island reset starts here. 🌞

Win a 4-night stay at The ISO + $100 F&B credit 🌊Share your favorite ISO memory—we will select a 1st and 2nd place winne...
15/09/2025

Win a 4-night stay at The ISO + $100 F&B credit 🌊

Share your favorite ISO memory—we will select a 1st and 2nd place winner!

👉 Enter here: https://bit.ly/4pdOSPV

09/09/2025

Island. Sky. Ocean. Find your stay at The ISO by Castle on Kapa‘a’s Royal Coconut Coast. 🌴 🌊

Coastal textures, local touches, easy energy ✨ Take a spin through the lobby at The ISO by Castle.
05/09/2025

Coastal textures, local touches, easy energy ✨ Take a spin through the lobby at The ISO by Castle.

29/08/2025

☀️ Mornings at The ISO
Wake up to the sound of waves, enjoy a slow island breakfast, and soak in the views that make you never want to leave.

Oceanfront lanai mornings, breezy interiors, and uninterrupted views from bed. This is what island life looks like. 🌴 ...
20/08/2025

Oceanfront lanai mornings, breezy interiors, and uninterrupted views from bed. This is what island life looks like. 🌴

13/08/2025

🌺 Stay Inspired. Stay Oceanfront.

Tucked along Kaua‘i’s Royal Coconut Coast, The ISO offers laid-back luxury with stunning ocean views, local charm, and island adventure just steps away.

Address

HI

Telephone

(808) 822-3971

Website

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