Hi, after arrive in Shanghai, you can have a little rest in the morning. The afternoon, you can go to visit Yuyuan Garden and Jade Buddha Temple. The night, you can go to Xin Tian Di to experience the wonderful nightlife there.
The second day, you can go to visit Lujiazui, Jin Mao Tower, Oriental Pearl TV Tower and the Shanghai Ocean Aquarium. At evening, you can walk along the bund and to experience the Huangpu River Cruise.
The third day, you can go to Chenghuangmiao to taste the local food and go to Nanjing Road or Huaihai Road to have a good shopping. Then go back to the airport.
You can also refer to the Shanghai Tour Packages(https://www.travelchinaguide.com/package/shanghai.htm) .
Wish you a wonderful journey!