Guest House Kotohira is a quirky ryokan attached to an onsen. As guests you get to use the onsen facilities for free - which include men’s and women’s outdoor hot spring baths across the road and a private family bath that’s available in the morning. It’s a little way out of town, so you’ll need to take a taxi there and back (no buses go that way), and all the information we found was Japanese only. Overall a very relaxing place to spend a couple of nights.