Find out what temperature the bubbling pools reach at Hoshino Onsen Hot Spring. Surrounded by spectacular nature, this mineral-rich spring is a popular day trip.
To visit this naturally heated water source, make your way to Karuizawa. You'll find lots of other things to see and do in this area, such as Mount Asama, Karuizawa Prince Hotel Ski Resort, and Karuizawa Prince Shopping Plaza.