River Oyunuma Natural Footbath is a lovely spot to visit if you're eager to be near the water. Enjoy a walk along the river and use the time to clear your mind.
To explore this flowing body of water, make your way to Noboribetsuonsencho. There are lots of other interesting attractions in the area, such as Jigokudani, Noboribetsu Marine Park Nixe, and Noboribetsu Bear Park.