Kanto Ageo, Saitama
Tennen Onsen Hanasaki no Yu
天然温泉 花咲の湯
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
刺青・タトゥーのある方(ボディペイント、シールを含む) ※但し、当館指定のカバーシール(85×105mm)1枚のみで隠せるサイズであれば貼り付けた上で館内をご利用出来ます。
In short: Tattoos must be small enough to cover with one 85 × 105 mm cover sticker from the facility.
Where it is
Kanto region, Saitama prefecture. About 34 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.