柴石温泉 (Shibaseki Onsen)
|7:00 till 20:00
Shibaseki Onsen probably has the best value for money in Beppu. For just 210 yen you get an indoor bath, rotenburo and a steam bath. On top of that, the onsen is located in gorgeous surroundings. Very much recommended!
If you want to take a family bath: it costs 1570 yen for one hour and can be used with a maximum four people.