Ueno is a great spot for a walkabout in Tokyo. It has almost everything that someone looking for an urban getaway could want—good food from countless cafes, restaurants, and food kiosks; a park (Ueno Park) to walk around; and even a children's zoo. Near the park, there are also museums and the National Museum of Space and Science (http://www.kahaku.go.jp/english/).
Then there's Ameyoko markets, which are packed with locals and tourists, taking in the experience of a bustling market.
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And Now for Something Entirely Different: Ueno
For something entirely different in old Tokyo (not so harried or frantic), go north to the quieter Ueno district.
Ueno is home to several major museums, a zoo, and Shinobazu Pond.
I preferred just meandering the residential streets and checking-out the upscale homes, hole-in-the-wall shops and cemeteries.