I visited Niseko in December 2015
Just lying there, all relaxed, not a worry in the world, the 42°C water encompassing you, was so relaxing. Just what my sore muscles needed. After a long day of skiing, having a bath in the onsen at the Hilton Hotel was perfect. We were cold after hours out on the slopes, our muscles were sore, we were tired. We could not wait to sink into the hot water when the skiing was done for the day. I have never enjoyed an Onsen as much as I did in Niseko.