Chubu Kawazu, Shizuoka
Amagiso
伊豆 大滝温泉 天城荘
Name in Japanese. Look for this on the sign, or show it to a taxi driver.
Allowed with conditionsStated by the facility
Onsen hotel with outdoor baths and pool. Hot spring (spring details not checked)

Tattoo rule
Allowed with conditionsStated by the facility
What the official page says
プール・日帰り温泉はタトゥーのある人でも入浴できますか? タトゥーに関してはラッシュガードや水着等で隠していただければご入浴いただけます。
In short: Tattoos must be covered with a rash guard or swimwear in the pool and day-trip baths.
Where it is
Chubu region, Shizuoka prefecture. About 50 km in a straight line from Hakone.
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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.