shanghai to Suzhou

For the Venice like attraction, which specific place do you mean, the Suzhou city or any other water town around SZ.
If you mean the SZ city, you can just find the buses for the city proper at the bus station. If you mean other water towns, you may need to take buses for reaching,
SZ is famous for the garden and some nearby water towns such as Tongli and Zhouzhuang. Zhujiajiao is a typical water town near Shanghai. They have different sceneries and attractions.

If you just want to see the water town, it is suggested to go to the Tongli or Zhouzhuang, which is much better than the Zhujiajiao. If you want to see the Chinese traditioanl gardens, the SZ city is the best choice.