Are you stopping by Chicago at all? It is a fantastic city to visit in the summer. There are many things to do. We have fantastic food, nightlife, shopping, museums, and parks.
Have you ever seen a baseball game? Wrigley Field is one of the best places on Earth to see one.
Just to name some things to do:
Navy Pier
Shedd Aquarium
Chicago Theatre
Willis Tower (Sears Tower, second tallest in US behind WTC in NY)
Chicago Symphony Orchestra
Architectural boat tours on Lake Michigan and the Chicago River
Art Institute of Chicago
Cloud Gate (the bean)
Millennium Park
Museum of Science and Industry
Food tours and beer tastings
Michigan Avenue for some of the best shopping in the US
Bike tours
Segway tours
The Field Museum
Lincoln Park Zoo
Second City (comedy club)
Buckingham Fountain
And so much more. If you do make it to Chicago, I'd be glad to show you some sights or just give suggestions! Cheers.