1.Tani no yu
Ancient cement structure with a spooky Amida Buddha statue and more mosquitos than you could shake a stick at.
Crusty bath inside a Shinto temple. This was probably the worst case of "floaties" that I can recall.
3. Netsu-no-yu Onsen
Free onsen, so I should have expected worse. Slimy, slippery and full of guys who I think were homeless.
4. Ichi-no-hara Onsen
This was one of the most bare bones onsen we went to. A cement hole in a dark wooden shack.
This was the first one we did. Run down and dark, and fat gangsters in the tub.