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The ISO

4-796 Kuhio Highway, Kapaʻa, HI  96746

(808) 822-3971

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The ISO by Castle

4-796 Kuhio Hwy, Kapaʻa, HI 96746

Room Reservations: +1 (866) 290-5708

Hotel Direct: (808) 822-3971

Email: [email protected]

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© 2025 The ISO by Castle The ISO supports the proper use of the ʻokina [‘] and kahakō [ō] in the Hawaiian language. However, these diacritical marks may have been omitted from our digital communication to provide the best possible online experience.