Namja Town is an indoor amusement park that is a good choice for those with children. There are 13 attractions in total, a Showa era street replicating 1950s Tokyo, Namja Gyoza Stadium which serves the different types of gyoza found throughout Japan, and Ice Cream City which sells just about any variety of the stuff you can imagine.
LocationSunshine City (サンシャインシティ), 3 Chome-1 Higashiikebukuro, Toshima, Tokyo 170-8630
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5 minutes from the East Exit of JR Ikebukuro Station
Entrance starts from ¥800 for adults