Toilet Bowl, a natural spa tub that gently rises and falls with the tide. However, water in the Toilet Bowl can rise and fall with greater intensity during inclement weather conditions, causing injuries. Because of that, The Bowl is now closed. References External links Hanauma Bay Nature Preserve – official website, City & County of Honolulu Hanauma Bay State Park Hanauma Bay Education Program – University of Hawaii Sea Grant Hanauma Bay Education Program. Volunteer Program, Outreach Program, School Visits. Friends of Hanauma Bay 1967 establishments in Hawaii Bays of Oahu Beaches of Oahu Monogenetic volcanoes Nature reserves in Hawaii Pleistocene volcanoes Protected areas established in 1967 Protected areas of Oahu State parks of Hawaii Submarine volcanoes Volcanic cones Volcanoes of Oahu