There are many onsen in Japan.
Onsens are hot springs.
Recently I went Kurokawa onsen in Kumamoto.
Kurokawa onsen has 24 different bath houses.
Those are ryokan, so you can stay there or you can just take a bath.
I went to two different baths.
One of them was a cave bath which the owner made by himself.
Onsens feel good.
The streets of Kurokawa onsen have a good atmosphere, not only nice baths.