I've got a speaking engagement in Chicago in August. I'm bringing my husband, our son (12) and another 12 year old boy. We'll be there 5 days. We've got the adult-only dinners covered but would like suggestions for places appropriate for 12 year old boys who are basically well-behaved and have no problem eating exotic foods but would not enjoy places where you've got to talk in hushed voices or wear dinner jackets. We'd like to steer clear of chain restaurants we could go to (or avoid) back home. Any suggestions?