I also am not from Chicago, but have done the Wrigley trip a couple of times. Shedd Aquarium is a must in my opinion and I'm not really a sea life kind of guy. I would put that as a must visit personally. I know that it is kind of kitschy and stuff, but I did like the Billy Goat Tavern and have gone twice. I thought that the burgers were fairly good and it is one of those neat kinds of places to visit. If you like art, the Art Institute is pretty good. I don't really know what I'm looking at with that stuff, but I had a pretty good time there. The parks in Chicago are great and try to go to Second City if you have a free night, both times that I went, I had an awesome time. Otherwise, in my opinion, just enjoy downtown.