For a day by the water with a difference, check out the bubbling pools of Tokusa Onsen. This spot is known for its mineral-rich thermal waters.
If you're trying to figure out what else there is to do after your visit to Tokusa Onsen in Minamiaizu, you're not short on choice. Drop by Hinoemata Shrine Kabuki Stage. It's conveniently close to the naturally heated water source and offers another insight into what makes this area tick.