Ooedo-Onsen-Monogatari(大江戸温泉物語)

Ooedo-Onsen-Monogatari, located in the popular Daiba area, opened in 2003 as Tokyo’s first and only onsen (hot springs) theme park. Inside the building, constructed in traditional Japanese style, there are baths fed by natural hot springs pumped from 1,400 meters underground, open-air baths perfect for enjoying fine weather or starry night skies, a foot bath set in a large Japanese-style garden, and plenty of other bathing facilities. There is also a re-creation of a traditional street from the days when Tokyo was called Edo to offer visitors an authentic onsen experience that is sure to be one of the highlights of their trip to Japan.

I think there is a good place for a tour or a day trip.
　
http://www.ooedoonsen.jp/higaeri/english/index.html