Map of Kuhonbutsu River green road 九品仏川緑道, Jiyugaoka Tokyo, an example of a former river turned into a path. In Jiyugaoka, near the train station, the path is tree-lined, with benches and plenty of nice shopping options. This area makes Jiyugaoka a very appealing day-date spot.
See more about the underground rivers and green roads of Tokyo at: Walking on water: the underground rivers of Tokyo 東京の地下河川や運河の地図
the tokyo files archives 東京ファイル 