This is one of our favorite "hidden gems" in the city! They have a game called 'whirlyball' but also laser tag, bowling, and a bar. Highly recommend!
This is a little outside of the city, but if you have some time, this is an awesome place to visit. Activate has a variety of rooms with physical games that you play with light up floors, light up walls, basketball hoops, climbing walls, laser mazes, and more. Its seriously just so much fun.
There is also a great mall out in Oak Brook if that's more your speed!
The riverwalk is a great free thing to do in the city. It goes along the river and out to the lake front trail. You can get some of the best views of the city and the lake for free!
If you're looking for a tour of the city, check out Wendella's boat tours. They are super interesting and again, the views are amazing.