Large ryokan complex. Better to stay than do day use as they might refuse day use customers if they are busy. There are two basement bathing areas with large rocks and outdoor baths that switch between men and women nightly. There is also a top floor view bath. Yumura Onsen is cooled from its 98c well temperature before used in the baths here. I found some very reasonable rates for single business hotel style rooms on Rakuten.