From Hamamatsucho bus terminal, in front of the JR Hamamatsucho Station, take the bus for Tokyo Big Sight and get off at the Telecom Center-mae stop. 2 minutes by foot from the Telecom Center-mae stop
Put on a yukata—a casual, thin summer kimono—and relax at Oedo Onsen Monogatari, a mega complex in Odaiba near Tokyo Bay with both indoor and outdoor hot springs, as well as a food and shopping arcade. It is conveniently located near the Telecom Center Station on the Yurikamome Monorail Line, about 20 minutes from Shimbashi Station.
Your experience at the Oedo Onsen Monogatari, billed as a "natural onsen theme park," starts from the point you check in and choose the design of your yukata that you will be wearing throughout your visit.
One highlight is the onsen, and there are a variety of baths including a large indoor bath that pumps water from a natural hot spring 1,400 meters below ground. Over at the Ashi-Yu foot bath, try walking on pebbles in an act that is said to improve blood circulation by stimulating the acupuncture points on your feet.
Also be sure to immerse yourself in the re-creation of Edo Japan (1603-1867) at the food and shopping arcade, where you can feast and shop to your heart's content. Try your hand at game stands that are true to the era, including one where you can channel your inner ninja and throw steel stars at a target.