Get pizza at pizzaria uno somewhere on Rush Street. Fabulous museums, of which the M. of Natural Science (right on the lake, just west of the "Loop") is the most impressive. There are sightseeing boat rides on the river, and that's cool. Don't forget to go to the top of the Sears Tower -- on a clear day you can see, if not forever, at least a very, very long way.
The Old Town School of Folk Music is worth digging up. Their phone # is 773.728.6000. They're at 4544 N. Lincoln Ave. Their website (www.oldtownschool.org) has concert listings for Friday and Saturday of this coming weekend.
Chicago has more and better ethnic diversity in the eating department than any place I've ever been. A wonderful hodgepodge of people from all over the world, and all the wonderful smells and tastes of their native cuisines. Get the phone book and look up in the restaurants-by-cuisine section. Pick something you've never had before.
Ride the "el" trains. It's a lot of fun, and a great way to get around.
There's a full-size replica of the leaning tower of Pisa, but it's waaaaaaaaaay out west, and the trains don't run that far.
Hmmmm. What else? Definitely have a Chicago-style hot dog (if it doesn't say "Vienna Beef" it isn't a Chicago-style hot dog!).
Ahhhh, the Windy City. Hell of a place to live, but a wonderful place to visit. Glad I'm gone.