Okinawa Churaumi Aquarium at Ocean Expo Park
With one of the biggest saltwater tanks in the world, this is the most impressive aquarium in Japan. Water in the tanks circulates with the ocean, allowing pioneering coral-breeding programs. There are sharks, freaky deep-water species, and thousands of other sea creatures. The star attraction is the 30-foot-deep tank holding a majestic whale shark, a dozen manta rays, and fish native to Okinawa. The aquarium is just one attraction in the much larger Ocean Expo Park. Usually free of crowds, the Oceanic Culture Museum with a planetarium (¥190) has examples of the boats used to to explore the Pacific, the Tropical Dream Center (¥760) houses a vast number of orchid species, and there is a reconstruction of a traditional Okinawan village (free). A short stroll north of the park is the idyllic village of Bise with its narrow roads lined by fukugi trees. You can get to Ocean Expo Park by car or via the Yanbaru Express bus service that runs from Naha Airport, via central Naha to the aquarium (two hours, 20 minutes). Up-to-date bus schedules are on the park website.
As one of Okinawa's biggest tourist attractions it is best to visit the aquarium first thing in the morning or late afternoon to avoid crowds. This means staying in Motobu for at least one night is ideal.