On my visit to shanghai two yeas ago,we went to Zhouzhang I think it was, large park ish area you had to pay to enter and another smaller place that was close.
Great place to visit, but the larger park/pay area was vert touristy and busy.
http://www.flickr.com/photos/pmac1985/page37/ these are a few.. The tone mapped ones were the other place I preferred (would ask the wife but she's asleep) maby you now where it is.
I'm hoping to visit a few more this ŷear as we didnt visit many places last year.
I have been to Zhouzhang as well as most other water towns in Jiangsu Province. I still think Tong Li is the best.