East Tokyo
Ueno Area (Taito Ward)
Ueno Park
A huge park area that often has food stalls on weekends, along with shrines and a large pond.
Museums
Nearby museums include:
National Museum of Nature and Science
National Museum of Western Art
Tokyo National Museum
Ueno Zoo
I personally haven’t visited yet, though the palace cats are very popular.
Ameyoko Market
Packed narrow streets filled with shops and food stalls. Very cool, but can get VERY busy.
Nezu Shrine
Especially beautiful during azalea season in spring.
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Sumida Area (Sumida Ward)
Kitajukken River
Located near Tokyo Skytree. I highly recommend visiting at night for the illuminations along the river.
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Kameido Area (Koto Ward)
Kameido Tenjin Shrine
Especially beautiful during wisteria season.