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The Kerama Islands (Tokashiki and Zamami) offer some of Japan’s most stunning beaches and marine life, and they’re accessible as a day trip from Naha. High-speed boats reach Tokashiki in 35 minutes and Zamami in 60 minutes from Tomari Port. Plan A visits Tokashiki’s Aharen Beach for snorkeling in crystal-clear “Kerama Blue” waters. Plan B visits Zamami’s Furuzamami Beach, famous for sea turtle encounters. Both...