However, there is a place I often go to, that is, there is a basketball court in Kunshan Garden, which is free of charge.

Badminton is played most often in the gym.

Intersection of Zhujiang Road and Qianjin Road.

There are many people after 6 pm every day, so grab seats early.

These are free places.

If there is a charge, there will be more.

But basketball often goes: there is a Hans fitness club at the intersection of Egret Road and Xiaolin Road, and the basketball court in it is OK.

Badminton: There is an Yingpaisi Fitness Club in Kebo, opposite the Qianjin Road Municipal Government in Kunshan. The badminton court inside is spacious and can accommodate four groups at the same time.

I hope it helps you.