Suggested schedule
Day 1
PM
Departure for Chicago, the Windy City
Overnight on the coach
Day 2
AM
Discovery by walk of the city center
PM
Commented cruise on Chicago River and Lake Michigan
Discovery of the Loop
Evening
Ascent of the Willis Tower or John Hancock Observatory
Day 3
AM
Visit of the Museum of Science and Industry and tour of the U505 submarine
PM
Free time for lunch on Michigan Avenue and the "Magnificient mile"
You will see the Wrigley Building and the Chicago Water Tower
Visit of Millenium Park and the Buckingham Fountain
Evening
Free time on Navy Pier
Day 4
AM
Fun day at the Six Flags Great America attraction park
PM
Road back home, overnight on the coach
Other suggestion
- Add a visit to Wrigley Field, the Chicago Cubs stadium!