Long touted as Oahu’s best snorkeling spot, Hanauma Bay’s state-protected underwater nature preserve requires first-time visitors to watch a brief film before descending to the beach. It’s worth the seven minutes. Formed by a volcano that collapsed into the sea, the park consists of a residual crater teeming with colorful and active marine life. Once water-bound, don’t touch the eels or the fish and expect harmless sea life to nibble your toes in search of crumbs. Bring your own gear — rentals can run about $20 — and carry snacks for a beach picnic, because food and drink are only sold at the top of the hill. The park is closed on Tuesdays.
7455 Kalanianaole Hwy.
(808) 396-4229