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It's a local hideout that most sailors fail to find. If you get into a taxi and ask for SASPA they will take you there. It's a traditional Japanese spa (sexes are separate) with hot, mineral, salt, and cold tubs. When you are done there are PJs you get when you arrive (for ¥500) and can eat or head up to the observation room and enjoy some quiet time. There is a movie room and a sleeping room along with pay for massages (starting at ¥2000 for 20 minutes). You can stay over night and must be out by 10:00 the next day.
Hausu ten Bosu
Dutch-themed amusement park, Sasebo's most famous tourist attraction. Be sure to see the fireworks every evening at 20:48.