i used to be stationed in great lakes- a group of us would hit up shedd's all the time! youll love it.. also Fields Museum is great, and the planetarium- its a great area to just walk around and see the sites
while youre there you have GOT to order a chicago style deep dish pizza! youll only be able to eat one piece-they are so heavy and sooo yummy!
i love chicago-its my favorite big city so far..