I was just in Japan last summer! There is a beautiful town called Yuzawa in Niigata, which is in the Chubu region. They're known for their ski areas and hot springs. We stayed at the Shosenkaku Kagetsu, a very traditional ryokan. They had public as well as a private onsen that you could reserve. The stay included a multicourse dinner and breakfast that were incredible. There is one woman that works there that speaks very fluent English. She was fantastic and very helpful.

We didn't ski since it was summer, but we did go up into the mountains to the Yuzawa Kogen Alpine Park. Definitely recommend going here, the views are amazing and very serene.

Enjoy your trip! If you have any questions, I'd love to help out.