Is it better to stay in guanzhou and spend our holiday there or book a flight to shanghai?

Hi ,me & my husband is going to lechang ,guanzhou for furniture purchase.we are there for furniture shopping from May 5th - may9th. We planning to book our return tickets on 12th or 13th of May. we would like to spend few days after our shopping in china. we will have 3 or 4 nights for our holiday.

do we have enough time to visit shanghai? we love nature , food and also little shopping ,and lots of night life.
Thank you,d paul.