Kansai Kobe, Hyogo
Arima Kaido Onsen Suzuran no Yu
有馬街道温泉すずらんの湯
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Super sento (large day-bath complex). Water source not checked; see the official page

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
タトゥーがありますが入浴できますか? フロントで1枚300円で販売しているタトゥーシール(約10cmx10cm)5枚以内ですべて隠れる場合のみ入浴が可能です。タオルや持参のシール・テープで隠してのご入浴は禁止しています。発見時はスタッフが注意致します。納得されない場合は退館頂きます。
In short: Tattoos must be fully covered with up to five 10 × 10 cm stickers (300 yen each) sold at the front desk.
Where it is
Kansai region, Hyogo prefecture. About 31 km in a straight line from Osaka.
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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.