The best area to stay in Kawayu Onsen is directly along the Oto River, particularly in the vicinity of the Kawayu Onsen public bathhouse.This central area is where you'll find the main cluster of ryokans and hotels, all offering easy access to the river. The unique appeal of Kawayu Onsen is the ability to dig your own outdoor bath in the riverbed, especially during the winter when the "Sennin風呂" (Sennin-buro or "1,000-person bath") is open. The area is fairly compact, making it easy to walk between accommodations, eateries, and the river itself.Couples looking for a relaxing and great experience will find this area ideal. Imagine unwinding in a private, hand-dug onsen right by the river, perhaps with a view of the surrounding mountains. Many of the ryokans here offer private onsen facilities in rooms or as bookable options, superb for a peaceful retreat after a day of exploring the Kumano Kodo pilgrimage routes.Families will also appreciate the convenience and distinctiveness of staying by the Oto River. The novelty of digging your own bath in the river is a memorable activity for all ages. There are also opportunities for river activities during warmer months, such as swimming or playing in the shallow areas.