I went to Chicago with my family in summer 2016. It was such an amazing trip. I recommend the bus tour for the first 2 days just to get an idea what the city looks like. Then, rent a bike! The best way to explore this city. It’s a beautiful city and the movie Divergent’s set is in Chicago.
One thing I regretted is: we didn’t have chance to take the subway! Chicago’s subway system is not under the ground, it’s outside, which is pretty cool.
(can see the bottom)
(You have to try this!)