The site of the 1975 World Expo has been converted into Ocean Expo Park, a sprawling whose main feature is the Churaumi Aquarium, Japan’s largest, and only recently surpassed in size the one in Atlanta, Georgia in the US. It encompasses 77 tanks holding everything from corals, reef fish, mammals, to dolphins and deep-water species. The show-stopper is the Kuroshio Sea tank, which holds nearly two million gallons of water and fish up to the size of whale sharks. The park also offers a culture museum and a typical traditional Okinawan village. For a change of pace, you can stroll tranquil streets in nearby Bise, which are overhung by picturesque Fukugi trees.