99. Higashimachi Onsen, Beppu True grandpa onsen. No shower, soap/shampoo, or staff. 200 yen entry, stamp available. Inside it's spacious, but the bath is very small — 2-3 people max. Clear water, hot-. There's another bath in the corner with nuclear-level hot water, but it's blocked off. Couldn't find a mineral composition chart.