This amusement-centric onsen has a wonderful array of baths to enjoy and novelties such as a the fish foot spa, and it is an enjoyable place to spend a few hours, but there are more traditional onsen in and around Tokyo which give a better insight into the public bathing culture.
Tokyo’s most famous onsen is undoubtedly Oedo Onsen Monogatari in Odaiba. Its attraction is a combination of easy access, a multitude of services, and Edo-style amusement arcade designed with young people and foreigners in mind (how many other onsen have an area where you can throw ninja stars?).
Despite the veneer of artificial “Disneylandiness”, it is a natural onsen with the water pumped up from 1,400 meters underground. There is also a “Doctor Fish” foot bath where you sit with your legs dangling in the water and let small fish nibble at the dead skin on your feet.