Hanauma Bay Nature Preserve

A curved bay inside an old volcanic crater on Oʻahu's south-east coast, protected since 1967 as a marine life conservation area. Its coral reef starts just offshore, making it one of the best and easiest places in Hawaii to snorkel, with hundreds of kinds of tropical fish and green sea turtles.

Non-residents must book an entry time online in advance, as numbers are limited. Bookings open two days ahead and sell out quickly. The bay is closed on Mondays and Tuesdays. Everyone watches a short video about protecting the reef before going down to the beach. Use reef-safe sunscreen, don't stand on or touch the coral, and go early in the morning, when the water is clearest.

Snorkel gear can be hired on site. Parking is limited, so come by bus or ride share.