Ni Hao, from SSAW htl, going to bus station by subway to find direct Shanghai to Zhouzhuang or by

Hi, you can surely take a distance bus to Zhouzhuang. From your hotel, you can take a cab to Shanghai Tourist Center near on No. 2409, Zhongshan South Second Road. There you can find many buses to your destination. The bus fare for a whole tour including the entrance fee to Zhouzhuang is about CNY150.
I'm afraid that it is a little tight to come back on the same day. After all, you have to spend some time on visiting.