There is a good moorage spot in Narao Port at the southern end of Nakadori Island. There is a floating dock on the south side of the main commercial port (32°50.8198’N, 129°3.5032E). The western side of the dock is occupied by a fishing boat but the eastern side is generally open (it shallows quite sharply there so mooring at the outer end is recommended). In addition, smaller boats (under 40’) can usually moor on the inner south side of the ferry dock. Moorage at both spots is free.
There are toilets in the ferry terminal and a hot-spring bath, a ten-minute walk from the dock.
The town (a 15-20 minute walk), like most Japanese fishing ports, is dying, but one can find a few small shops and restaurants.
It is recommended to get a rental car to explore Nakadori Island and nearby islands. There is a car-rental office in the ferry terminal, but be sure to ask for a small car as the roads are narrow. In addition to the many churches, places worth visiting include beautiful Hamaguri Beach and the whaling museum. For the adventurous, it is also possible to find remnants of Wako Pirate lairs dating back 500 years. As for food, Nakadori Island is famous for its udon noodles.
For more details, see here.
Information provided by Kirk Patterson of Konpira Consulting.