混浴でした。

Thanks for your reply. I understand the culture, and the only reason why I asked is because on multiple websites, this onsen is listed as tattoo friendly. So maybe they would want to get that removed from those websites.

As far as I know ,,No".

This place is very isolated and is, I am afraid,not for the children. If you have a car you might get to some local towns near by but I doubt very much that you can find what you would look for. Hoshi Onsen is wonderful and surely worth visiting but in my opinion not for a family with active children. They may say you can have a hike out in the mountain but when we were there they told us to be very careful in the forest because there would be some bears with cubs and wild bigs. There are no other buildings, not even another hamlet around this area. Even in Saru-ga-Kyo where we change the bus to get to Hoshi Onsen there are not may shops where you can buy genuine western food. We stayed in Hoshi Onsen for three days, three nights, and enjoyed very much, but 4 nights seem to be a bit too long with children.