Myoban Onsen Yunosato Open-air

This public bath is part of a complex on a hill. They stamp your pass. As I understand it, the main attraction of the complex is private baths in wooden triangular huts (old-fashioned style). The path to the public area doesn't go through these huts but runs separately, slightly to the right of all the hut activity. In the public area there are two baths - indoor and outdoor. The outdoor one looks nice, comes with a decent mountain view. The indoor one is a simple rectangular bath. No showers, just faucets and basins. Water is milky, slight smell, normal water temperature. Overall solid, but you could skip it in favor of other options in Beppu, unless you're getting the private huts.