From Mt. Yumihari Observatory you will be able to see the whole city of Sasebo, Sasebo Port, and Kujukushima Islands (99 Islands).
You may drive up to the top or hike to the top. I chose to drive. The road was curvy and fun to drive. There is plenty of parking up top and there are bathroom facilities. They even have drink vending machines in case you are thirsty.
I enjoyed how accessible this area was. You may use ramps and/or stairs to look out over Sasebo.
The lookouts were beautiful and I would love to come back at night. I will have to at some point! Around Mt. Yumihari Observatory are some history plaques about WWII. Mt. Yumihari and Mt. Tajimadake housed military air defense starting in 1938 and another facility was completed in 1942. You can still see the areas where they were housed. The U.S. bombed Sasebo in June 1945 destroying 48% of the city. The U.S. saw Sasebo as a threat because it housed Imperial Japanese Navy’s Third Naval District.
Hale of a Journey 