I have lived in Japan for 20 years.
My family loves the outdoors and we love hot springs. We spend a lot of time hiking in the mountains, playing by the river and then relaxing in our onsen (volcanic bath). We are also avid snowboarders and skiers and love to explore the backcountry.
If that sounds good to you, you'll probably enjoy your stay at one of our homes! We will probably not be around when you visit, but hope you will enjoy your time!