Make sure you catch a morning flight to Chicago - you'll arrive in time to catch an afternoon architecture tour of the city, by river boat. Chicago's the home of the skyscraper, and you get some awesome views of some of the world's first, and finest, tall buildings from the river. From Trump Tower to the Wrigley dynasty's HQ, you'll feel like you know the city a lot better at the end of the tour. The guides are great - typically friendly mid-Westerners keen to share their enthusiasm for one of the world's great cities.