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Reservations are required for all non-Hawaii residents to visit Hanauma Bay Nature Preserve. Tickets are released two days in advance at 7:00 a.m. HST on the official Honolulu Department of Parks and Recreation website. Tickets sell out almost immediately. 

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Shark's Cove, located on Oahu's North Shore in Pupukea Beach Park, is a premier, free-entry snorkeling and diving spot within a Marine Life Conservation District, characterized by rocky, tide-pool-like, lava rock formations. It offers rich marine life, including turtles, octopus, and diverse fish species, but it is best visited in summer due to dangerous winter waves.