Visiting Shedd Aquarium is a must for Chicagoans as is for visitors. You can easily spend a few hours there and not get bored. Generally, the admission to the Aquarium costs around 25 dollars but there are also discount days, when the admission is free. You can visit Shedd Aquarium for free on October 5, 6, 12, 13, 26 and 27.
I like dolphins and sharks exhibit the most. The Caribbean Reef exhibit is also great. I think that everybody who visits Shedd Aquarium will have a relaxing and amazing time like I had.