we are arriving in Chicago at 3pm (= 5pm I gather by the time we clear immigration) flying out the next morning to Phoenix. Staying at the Hilton in O'hare. Current plan - train into downtown, get off at the loop, look at lake Michigan, quick boat trip if we have time, a walk along a bit of the magnificent mile, cab to somewhere like gibson's for food, then back to O'Hare before midnight.

Is that possible?