No trip to Oahu is complete without a visit to Hanauma Bay, consistently one of the Oahu Tour‘s top 3 attractions.
Formed when the seaside face of a volcanic cone broke away, this pristine marine ecosystem allows snorkelers to get up close to living coral and abundant reef fish. This of course includes the Hawaii state fish, the Humuhumunukunukuapua`a. Just remember that reservations are now required to enter the Hanauma Bay Nature Preserve.