A national park of islands 40 km west of Naha, with water clear enough that the colour carries its own name, Kerama Blue. Ferries leave from Tomari Port inside the city, so this is the one island trip from Naha that needs no second flight or long drive. Zamami and Aka are the usual targets for snorkelling; Tokashiki is the largest and has the longest sand. Winter sailings are weather dependent.