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One of Tokyo's largest spa complexes, using water pumped from 1,700m below Tokyo. Outdoor pools, saunas, beauty salons, restaurants and more across 5 floors. No tattoos or children under 5. Children under 17 can only enter with an adult and must leave before 6pm.
小石川後楽園
Laid out in the 17th century, this splendid traditional garden boasts a large collection of trees and flowering plants that provide touches of beauty all year round. Winding paths, wooded hills, ponds teeming with ducks and fish. The place can be a little crowded at certain times of year (such as during the cherry blossom season in late March-mid April), but there's plenty of room for everyone.
六義園
A classical Japanese park with ponds, hills and teahouses, that was built in 1695 by Yanagisawa Yoshiyasu, a Tokugawa daimyo. It's a popular cherry blossom spot in spring and is lit up at night at this time.
小石川植物園
Not one of the great gardens of Japan and sometimes a bit shabby, but a pleasant stroll with interesting trees, a medicinal herb garden and several ponds. Not to be confused with Koishikawa Korakuen.