During the cherry blossom season, the Daizawa section of the path is full of party-goers. But, only on the weekends, weekdays are for the locals and is definitely the best time to visit. The fall colors are also gorgeous, and in summer the sounds of locusts and frogs will take you to the countryside!
The path starts at the border of Setagaya-ku and Shibuya-ku, near Ikejiri-ohashi Station on the Tokyu Den-entoshi Line. It is actually two parallel paths, they split just a few minutes walk from the beginning. The upper path cuts through Daizawa, before heading deeper into Setagaya - above the Odakyu line. The best section is from the beginning to Kannana-dori.The lower path passes very close to Sangenjaya Station (one stop from Ikejiri-ohashi) then up toward Kyodo Station (of the Odakyu Line), where it crosses over.
There are sections of the path that still need help, but Setagaya is working little by little to address the situation. Even at its weakest points, it is still car and motorcycle free - nothing to complain about!