Ganiyu is a small bath across the river from our Ryokan. It can be used for free by anyone at anytime. This bath is probably not for everyone, because next to river runs a street from which bathers can be seen. There is no privacy. The changing area is 20 meters from the bath under a bridge.
It was fun to try one time, but I don't think I will go again if I ever go back to Nagayu. The water wasn't so warm and the floor is slippery from alga, which also float around in the water.