@ shuangtou bridge, changqiao park, Westlake, (PSed a bit at the background)
Taichi, also known as shadowboxing, know more about it, click its wiki link http://en.wikipedia.org/wiki/Tai_chi_chuan
Taichi chuan is actually much more popular among senior citizens and foreign visitors, its soft martial technique really can calm you down, especially in such a serene environment.
There're regular group Taichi classes put on at the westlake, some of them are free of charge.
Well, my mom is "master" of Taichi, although I know nothing about it. I'm thinking to learn some solo routines (forms), so I can calm myself down as well. haha