Grant Park is a real time commitment — fit it in only if it's a priority.
Allow 1–2 hours.
A vast, open lakefront park that's the stage for the city's biggest events and a fine place to lie on the grass with the skyline behind you. The catch is that as a day-to-day destination it's somewhat featureless — its best moments are during festivals, and the more designed corners (Millennium, Maggie Daley, Buckingham) are what actually pull visitors.