Takaragawa Onsen

This is a popular inn for its world-class outdoor spa. 
We have wonderful open-air baths facing the Takaragawa River, and offer Japanese dishes, a free Wi-Fi in the lobby, and free transportation to and from the station. (Pick-up service twice a day: departure from Jomo-Kogen Station at 13:00 and 15:00. By reservation only)

http://www.takaragawa.com/english.html