pls advise how should i arrange hangzhou - wu zhen - xi tang - su zhou

Hangzhou East Bus Station has regular buses to Wuzhen. It is not very convenient to travel between Wuzhen and Xitang. Generally, you can take bus from Wuzhen to Jiashan, arriving in Jiashan West Bus Station. Then you have to get to Jiashan North and change to bus to Xitang, by public transportation. Perhaps you can just hire a taxi. Xitang has direct buses back to Suzhou. I would suggest one water town, because water towns there are look the same. You can save some time to see other places.

Thanks Cindy.

Take bus from Wuzhen to Jiashan, arriving in Jiashan West Bus Station. Then you have to get to Jiashan North and change to bus to Xitang, by public transportation.
CK: if i changing bus as you recommended, pls advise how long it will take? (roughly)

Perhaps you can just hire a taxi. Xitang has direct buses back to Suzhou.
CK: Please advise how much if take taxi from Wuzhen to Xitang?

Water town you suggested was located at Xitang or Wuzhen?

It takes about 20-30 minutes or so from the bus station to Xitang and it won't be farther from Jiashan West to Jiashan North, about 15 minutes by taxi. It takes about 100RMB from Wuzhen to Xitang, having a negotiation with the driver! Xitang is smaller but less commercial, and also cheaper. Anyway, you should make the decision by yourself.

Dear Cindy,

thanks for your prompt reply. ;)