Private open-air bath in your room
Aratashi Minakami
Every one of the 42 rooms has its own open-air bath filled with natural onsen — a soft alkaline spring, in a quiet concrete building above the gorge.
from ~$253 / nightView stay →
Every property listed here has a private bath — a reservable private bath or an open-air bath in your own room — so tattoos are a non-issue, and so is privacy.
Gunma · Getting there: In Minakami Town, Gunma, along the Tone River gorge below Mt Tanigawa
Reservable private bath
KKR Minakami Suimeisou
A lockable family bath is free for guests, about 40 minutes at a time, in a riverside lodge run by a mutual-aid association (open to general guests too).
from ~$119 / nightView stay →
In-room bath + reservable private bath
Ryuudo
A hot-spring theme park of a ryokan: 18 open-air baths scattered over the grounds, every one used privately, free, around the clock — plus rooms with their own open-air baths.
from ~$204 / nightView stay →
Reservable private bath
Shin Sarugakyo
Two reservable baths are free on a 50-minute reservation at this small inn reopened in 2026 on the Sarugakyo lakeside — the water is the local weakly alkaline source.
from ~$196 / nightView stay →
In-room bath + reservable private bath
Zazan Minakami
Three reservable baths (rock, tub and an indoor white-lotus bath) plus rooms with open-air baths over the Tone River — all free-flowing source water.
from ~$113 / nightView stay →
In-room bath + reservable private bath
Kinseikan Seseragi
Two rooms have their own open-air baths (Shigaraki ceramic or hinoki), and the Sakuyahime-no-yu bath can be reserved — the inn draws on four free-flowing Tanigawa sources.
from ~$333 / nightView stay →
In-room bath + reservable private bath
Ooedo Onsen Monogatari Premium Matsunoi
Five reservable baths (paid) and rooms with open-air baths, at the big riverside resort reopened in 2026 under the Ooedo Onsen Monogatari brand, drawing its own source.
from ~$134 / nightView stay →
In-room bath + reservable private bath
Tatsumikan
Three reservable baths — two all-hinoki baths and a garden open-air bath with a rock sauna — plus rooms with open-air and semi-open-air baths, one type explicitly free-flowing.
from ~$127 / nightView stay →
In-room bath + reservable private bath
Syoubun
Mukoyama Onsen water is poured into three reservable baths, free for every guest, and most of the nine rooms have their own open-air bath — a small, food-loved inn in the hills.
from ~$473 / nightView stay →
Prices are a guide from rates checked on Klook in November 2026 and change by date and room type — always confirm the live price on the booking page.