Huang Pu Bing Jiang (Huangpu river riverside in Huangpu district) is a place I like to walk around especially at night. You may jogging or ride a bike along the Huangpu river.
The cache is located near the start point of Huang Pu Bing Jiang. It is a busy place with a lot of mugglers nearby, and there are a lot of guards around. Be careful when you search.
I think you could find some hint from the title. The cache could be found along the path. Do not step on the green grasses.
You are looking for a small magnet tube.
Bring your own pen!
After read the funny log from STF, I think I need to add BYOP in the listing. And thank you Nimariel. You really made me laugh :)