This cache will take you deep into Zhongshan Park. It is a nice park, which you don't find a lot in Shanghai. There's usually a lot of people in the park, but there shouldn't be many people hanging around GZ.
Be aware of the GPS drift in China. If you are using Google map, the GPS coordinate will not macth the location on the map. Using OpenstreetMap or any Chinese map app should give you a more accurate result.
The cache is hidden next to a pond (be careful, the ground might be slippery). Be aware of muggles. The cache is a small black container, with room for small items. It should be waterproof as long as it is undamaged and closed properly.