Personally, you would better visit some places of interest in the city center, such as the Bund, Nanjing Road, or Yuyuan Garden and etc. For more scenic spots details in Shanghai, you can refer to Shanghai Attractions(https://www.travelchinaguide.com/attraction/shanghai/) .From pudong airport, you can take the maglev to its terminal-Longyang Road Station by around 10mins, and then take a taxi or subway line 2 to the Bund or other places. To save time, it is better to take a taxi after getting off the maglev.