I don’t think I have seen as many people catching a few zzz’s on public transport as in Tokyo….probably because of all the shopping opportunities.!! And the fish market @ 4am is the place to be….watch out for the forklifts that whiz around with the heavy tuna carcasses! Takeshita Dori’s narrow pedestrians-only (thankfully!) length is lined with uber-trendy clothes shops interspersed with the kind of refreshment stops likely to appeal to its mainly teenage market. This is a great place to come, and in particular on a Sunday, if you want to see Tokyo’s youth at play.  Also, a visit to Yoyogi park on Sunday, when its filled with people out for a stroll, or picnicing under the trees, or sword fencing, or practising other sports. Not to mention, a group of friends that meet up there to provide impromptu drumming concerts and throngs of youngsters who set up mics and electric guitars and perform near the park’s main entrance. (This park is also filled with stunningly beautiful cherry blossom in spring).
Between the entrance to Yoyogi Park and Harajuku Station there is a little bridge which on Sundays becomes a popular spot for Cos-play. Cos play is some weird Japanese thing which results in young Japanese school girls dressing up bizarrely as anything from French maids to Pokemon characters and posing for photos with passers-by. Fascinating, but strange.