Spa & Sauna

Gold Spring, Silver SpringAnd a Private Barrel Sauna

Held in Miyazu's natural surroundings, the deepest kind of "onkatsu" — hot‑spring wellness — comes together here: a private Silver spring in every villa, a reservable Gold spring drawn from a rare iron‑rich source, and a genuine barrel sauna with self‑löyly, all with Amanohashidate on the horizon.

The Four‑Step Experience Spring & Sauna Details

Steam, Stillness, and Nothing Left to Rush

Every villa holds its own private Silver hot spring — soak whenever you like, any hour of the day, with no one else around. Elsewhere on the grounds, at KAI, our shared bath and sauna facility, a reservable Gold spring and a proper barrel sauna are waiting, its cold plunge drawn from that same luxurious Silver water.

The Experience

Four Steps to Getting "Totonou"

In Every VillaA Gentle Silver Hot Spring

Colourless, clear, and kind to skin — every villa's private onsen is yours around the clock. Soft water warms you from the core and quietly dissolves the day's fatigue in a luxurious open‑air room bath.

Reservable, Guests OnlyA Rare Gold Hot Spring

A special shared spa area set among the grounds' greenery. This ferruginous "Gold" spring is rich in iron and sodium — clear underground, it oxidises to a reddish amber the moment it meets the air, with a faint mineral scent and a mild, soothing touch.

Five Senses, OpenA Barrel Sauna with Self‑Löyly

A wood‑warmed, shared barrel sauna, its rounded form spreading heat evenly to the core. Choose your own löyly at your own pace — a crisp water löyly, or a hōjicha (roasted green tea) löyly that fills the room with a warm, toasted fragrance.

Cool Down, Miyazu‑StyleA Silver‑Spring Cold Plunge

After the heat, a cold plunge drawn from that same Silver spring — cold, but gentler than plain water. Then outdoor air bathing year‑round, windows open to Miyazu's clear air, with soft drinks waiting in the relaxation room for afterward.

New, Deluxe Suite Only

Your Own Private Sauna, "Aurora"

Aurora private sauna in the Deluxe Suite

Exclusive to the Deluxe SuiteA Canadian Cedar Sauna, All Your Own

The Deluxe Suite now holds its own private "Aurora" sauna — a genuine Canadian wood‑burning sauna, with nobody to share it with. Western red cedar throughout, an L‑shaped two‑tier bench, a large glass window, and 70mm insulation for proper heat retention.

Heat Source: Wood stove — hybrid radiant and convection heat
Capacity: 8–9 people
Max Temperature: 90°C
Room Volume: 14.7 m³

Spring & Sauna Overview

What's in the Water

Villa Rooms — Silver Hot Spring

Water Quality	Weakly alkaline, simple thermal spring
Benefits	Joint pain, lower back pain, neuralgia, frozen shoulder, sprains, poor circulation, sluggish digestion, mild hypertension, mild glucose intolerance, mild cholesterol, mild asthma, autonomic fatigue
Character	Rich in metasilicic acid, a natural moisturiser — known locally as the "beautiful skin spring"

Shared, Reservable — Gold Hot Spring

Water Quality	Sodium chloride strong saline spring
Benefits	Neuralgia, muscle & joint pain, frozen shoulder, motor paralysis, joint stiffness, bruises, sprains, chronic digestive conditions, poor circulation, recovery from illness and fatigue
Character	High salinity with strong antibacterial properties; excellent heat and moisture retention with circulation benefits

Shared, Reservable — Barrel Sauna

Style	Wooden barrel sauna
Fittings	Self‑löyly, dedicated cold plunge, outdoor air‑bathing space
Cold Plunge	Silver Hot Spring
Included	Soft drinks in the fridge (Oronamin C, Pocari Sweat, etc.), hōjicha — drinkable, and usable for self‑löyly