so i know a lot of my fellow fg'ers are in chicago. my girlfriend and i are visiting this weekend and i've never been. is there anything that's not to miss? our hotel is on the corner of N michigan and upper illinois, a few blocks north of millenium park. we won't have a car so things have to be within a walking/easy riding distance, but i know there's plenty of stuff around there. we've been through all the travel-y touristy stuff, just wanted some input from the locals!

p.s. my gf had suggested the idea of renting bikes for a day from www.bobbysbikehike.com does anyone have any experience with them? i think it'd be cool to rent a madison