The hot spring is 100% natural and is completely free-flowing, without heating, adding water, or circulating. The building is old, but it is conveniently located, just a five-minute drive from the airport, and parking for passenger cars is free. (An additional 2,000 yen will be charged for parking nearby, for large buses, and for large trucks.)
The vast 430,000 m2 grounds are packed with fun things to do, including the Main Building, which features a private natural hot spring, swimming pool, and renovated bird zone, as well as the Outdoor Zone, which features renovated cottages, a campsite, and outdoor play equipment!