Yes, it is a good idea. It is fast to go to Suzhou from Shanghai. You can take bullet train from Shanghai Railway Station to Suzhou half a hour later. Many bus station in Shanghai operate the route to Suzhou, a bit more than one hour or so.

Thanks Mr. Jamie.
What do you recommend in Suzhou for a day of visit? Thanks.

You can see the private classical gardens in the city center. Or take bus at south or north bus station to Tongli, an old water town.