I recommended Mt. Yumiharidake Observation Deck,Sasebo Asaichi,JMSDF Sasebo Historical Materials Museum,Sasebo City Museum Shimanose Art Center,Miura Catholic Church
Here are some hotels near Mt. Yumiharidake Observation Deck: Yumihari-No-OKA Hotel,Quintessa Hotel Sasebo,Central Hotel Sasebo,Kujukushima Bayside Hotel & Resort Flags,Sasebo Palace Hotel