DO NOT MISS the Chicago Air&Water Show!
There are huge crowds on Sat. & Sun., so here's a Chicago secret: you can see almost the same show on Friday, when all the planes rehearse - but, without the 1.5M people each day on the lakefront. Take the afternoon off!
If you don't mind huge crowds, you may find yourself going BOTH days - Sat. & Sun., the event is that great!!