Suggestion: Bring your ID card and photo, and apply for a Kunshan Tourism Year Card of 128 yuan when you arrive in Kunshan, so you can visit all the scenic spots in Kunshan (including zhouzhuang town, Jinxi Ancient Town, Qiandeng Ancient Town, Lin Ting Park, etc.) for free and unlimited times, which is cost-effective. On weekends and holidays, there is a free shuttle bus from the gate of Lin Ting Park to the ancient town.

Travel from Kunshan to Shanghai is basically a one-day tour, returning on the same day. After all, the train between the two places is only half an hour away. You can stay in Shanghai if you have a lot of money.

There are many free scenic spots in Shanghai, such as Nanjing Road Pedestrian Street, Bund, Lujiazui and Oriental Pearl. Take photos when traveling.

It's also convenient to get from Kunshan to Suzhou, and the train takes half an hour. If you go to Suzhou, the city is definitely not as atmospheric as Shanghai. If you want to visit some gardens (you need to buy tickets, the price is not good at all, it is not recommended to go. Because I think there are few places to spend money, haha), you can go to Jinji Lake for a week, which is beautiful. Or go to Mudu Ancient Town to climb Lingyanshan or Lingyanshan Park (free of charge).

There are many more, and your classmates will definitely have good introductions.