Ryokojin Sanso in Kirishima Onsen

Kirishima Onsen area

The Kirishima Onsen area (霧島温泉) is a cluster of small onsen districts spread across the volcanic slopes of the Kirishima mountains, and the most practical base for hiking Takachihonomine and Karakunidake. The main village is Maruo Onsen — a handful of older hotels, a Lawson, and a tourist office with a restaurant. Along the main road, vents in the ground release sulphurous steam with some persistence. There is not much to do beyond a walk to the local waterfall or a short hike nearby — the point is to spend your days in the Geopark and come back to a good onsen in the evening.

Why we stayed at Ryokojin Sanso

Ryokojin Sanso stands in the forest about 2 km above Maruo Onsen. We chose it for its quiet hillside setting, views across the valley towards Sakurajima, and private outdoor baths hidden among the trees. It feels pleasantly remote, but not inconvenient: the ryokan provides pickups from the tourist office in Maruo Onsen, making it a practical base even without a car.

Rooms overlooking Sakurajima

The rooms are comfortable rather than sleek — warm, well-kept, and showing their age in a way that feels appropriate for a mountain ryokan. All rooms face the valley, with views stretching across to Sakurajima in the distance. We stayed in a twin room where large glass doors open onto a terrace, which we made good use of after long days on the trails. Deer appeared regularly in the garden below, usually in the late afternoon.

Private onsen among the trees

The ryokan's outdoor baths are scattered through the forest and garden surrounding the building, and all of them — including the rotenburo — are available for private, bookable use. You reserve a 45-minute slot in advance; at your time, staff hand over the key and point you to the bath. Getting there means stepping outside in slippers and following a lit path through the garden or up a short slope, which is part of the appeal. One private bath per day per room is the limit, so it's worth looking at the photos on their site beforehand and deciding which one you want.

We particularly liked the Hinoki and Akamatsu baths in the woods. That said, the public indoor bath had the best view of all — directly towards Sakurajima, and unbeatable at sunset. There is also a foot bath in the garden. The gender-separated public bath in the main building rotates between men and women each day and can be used at any time without booking.

Kaiseki dinner and breakfast

We stayed three nights. On the first evening we were seated beside the glass panel overlooking Sakurajima — good timing. Dinner and breakfast are both kaiseki: multi-course, well-prepared, and varied across nights.