A floating world of fish abounds at Hanauma Bay. Located east of Honolulu near Hawaii Kai, its underwater park is a perfect hangout for all snorkelers. The 100-acre keyhole-shaped nature reserve contains a $13 million Marine Education Center. Learn about the different marine species coexisting in one of Hawaii's largest glassy water reef communities. A 30 minute introductory video is required before venturing down into the bay via tram or foot.