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Old fortress and nature preserve in Tokyo Bay. This is a private island and the only natural island in Tokyo Bay. Locals frequent it for hiking and it is a popular sun-bathing and barbecue in the summer. The island closes every evening, so make sure you don't miss the last ferry off (17:00 in Mar to Oct, 16:00 in Nov to Feb) or you will be marooned there alone overnight. There is no night staff.