Nanjing Road and Huaihai Road are the first shopping destinations. Nanjing Middle Road and West Road are the busiest. There are several super-large department stores almost every few steps. There are also many famous food stores, such as Shanghai No.1 Department Store and Shen Dacheng. If you want to buy Shanghai specialty snacks, that's the best place. You can go shopping first and buy some special products when you leave. Because the shelf life is not very long.
The Bund is connected with Nanjing Road. Go straight to the end of Nanjing East Road. I hope you can check the others yourself.
Have a nice trip!