6. Toshimaen Niwa-no-Yu

Toshima Niwa-no-Yu
Two of the baths at Toshimaen Niwa-no-Yu (©Toshimaen Niwa-no-Yu)
Take the Oedo Line or Seibu Ikebukuro Line to Toshimaen station; this facility is right next to the Toshimaen amusement park. Children 12 and younger are not admitted, which makes for a quieter bathing experience. Also adding to the quiet is the 4,000-square-meter Japanese garden surrounding the bathhouse. A soak in the roten-buro while gazing at this garden is enough to make you forget you're in one of the world's largest cities. English-speaking staff are on hand. (Open 10:00 A.M. to 11:00 P.M.; 2,250 yen for adults, 315 yen for swimsuit rental.)

http://www.toshimaen.co.jp/niwa-yu/niwanoyu.html (site is Japanese only)