Shanghai Tourist Hub in Hongkou Soccer Stadium should be the nearest station to your place. You can get there one day in advance to buy the ticket to Zhouzhuang. The earliest bus is at 8am in the morning. You can get back from Zhouzhuang to Zhujiajiao in the afternoon. The bus can be found in the bus station 15 minutes' walk from the entrance of Zhouzhuang. Stay one night in Zhujiajiao and get back to the city center next morning. The city bus from Zhujiajiao arrives at people's Square. You can take subway Line 8 to Lao Xi Men, walk a little to Yuyuan. Then take subway Line 10 at Yuyuan back to Wujiaochang directly. You can also go to Zhujiaojiao first and then to Zhouzhuang. Zhouzhuang and Zhujiajiao are all ancient water town, which just look the same. I suggest you choose either of them. Zhujiaojiao is nearer from Shanghai, Zhouzhuang is more famous.