Chicago

I have the opportunity to go to Chicago in June. How cool! My boss and I were invited to attend a training and the company offering is paying airfare and hotel. Even better! We originally scheduled our flights to leave on Father's Day, June 15 and return on Tuesday, June 17. Jon heard of the trip and thought it would be fun to go along. One of his/our college friends lives near Chicago, so Jon called and asked if we could stay with him and his family for a couple days. My wonderful parents gave Jon a frequent flyer ticket for Father's Day/Birthday/Christmas/Halloween/Thanksgiving/etc. Soooooo, we are leaving on Friday, June 13 (we're not suprsticious) and still coming home on Tuesday.

Here's the best part of it all - the training is only Monday noon to 5:00pm. Any great ideas for stuff to do and see in or around Chicago? Neither of us have been there as tourists (I've been through the airport and the train station once each).