Kanto Naka, Ibaraki
The Botanical Resort Rinne
ザ ボタニカルリゾート 林音
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Day-trip onsen and sauna. Hot spring (spring details not checked)
Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
入れ墨・タトゥーがある場合の利用は？ 当館指定のカバーシール（12.8x18.2センチ、B6ブックマガジン程度の大きさ）を入館時にご購入いただき、スタッフによる貼り付け確認後に館内をご利用いただけます。
In short: Tattoos must be covered with the facility's 12.8 × 18.2 cm cover sticker, bought on entry and checked by staff.
Where it is
Kanto region, Ibaraki prefecture. About 105 km in a straight line from Tokyo.
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Rules can change. Check the official page on the day you go. Any paid link is labelled next to the button. We have not visited this bath ourselves.