This is one of the national nature treasures of Japan created one day 100 years ago when a person dropped some beans in an outdoor soaking pool and a smart monkey went in to get then and liked it so much he stayed and others get the idea from him. Then volcanically heated special monkey pools were created etc.
Entrance to Monkey park
Rules
Our 100 year old ryokan at the entrance
Ranger station
Volcanic hot springs in the park which heat the pools