Originally Posted by
ksandness
I recall walking along the Sotobori (old moat around the Imperial Palace, parallel to the Chuo-Sobu Line tracks) and seeing rows of sakura.
Yep. Between Ichigaya and Iidabashi. The path/park on the South of the tracks is a hugely popular spot with the office workers. You'll see junior staffers guarding patches of blue plastic during the daylight hours and it gets pretty impassable in the evenings. Street party turns to street pizza pretty quick.