Jigokudani Monkey Park, Nagano Prefecture Tourist Attraction, Japan Travel.

The long-awaited monkey hot spring experience, but... Attention visitors: From September to November, it's monkey mating season, and the food on the mountain is more abundant than in the hot spring area, so the monkeys all go up the mountain, leaving no monkeys in the hot spring area. The Japanese won't inform you in advance; they'll make you walk half an hour to the ticket office before telling you. It's really too much! But the path is not difficult to walk, mostly flat, and quite interesting. Also, if you come in early November, be aware that the Shiga Kogen road section will be closed for winter every year in early November.