Can we make a city tour to Shanghai?

You can travel on your own. You can take the subway line 2 to reach the Lujiazui Station, where you can see the Oriental Pearl Tower and the Huangpu River. After that, you can take the same subway to reach the Nanjing Road, which the most famous shopping street in Shanghai. In the afternoon, you can take the subway line 10 from Nanjing East Road Station to visit Yuyuan Garden. Then you can travel around that area and then back to subway line 2 to go back to airport.
Hope these information is useful for you.