Toya Kohantei Hotel

Higaeri at a hotel. There are indoor baths, outdoor baths, barrel baths, and a small sauna. The top feature is the view of Lake Toya (and yes, you can buy Gintoki's sword here. #anime moment). The seagulls flying by add to the experience. If you stay overnight, you might be able to see the fireworks they launch every day. Official site: https://www.toya-kohantei.com/onsen/