Check out the many prior such threads. Not trying to shut down this discussion - just suggesting additional resources.
Where is the AirBnB located?
The Field just had a substantial redo - they moved their big T Rex from the main gallery to a separate gallery, and have a new huge skeleton (Gigantosaurus?) and various pt-beasts hanging from the ceiling. My son works there, and says both are pretty cool. When my other kid was recently in town, she said the Egypt exhibit was well worthwhile. If you like natural history museums, the Field is pretty cool. But if not - or if you’ve seen a bunch of other NH museums, you might want to go elsewhere.
Once you get to Grant Park, you can walk to Millenium Park, Navy Pier, Buckingham Fountain, the Art Institute, The Field, The Shedd Aquarium, and the Adler Planetarium. More than you can see in a day. You should get out to the Adler peninsula, or Northerly Island (Meigs), to get the money shot of the Chicago skyline. Take your own postcard photo.
I’d suggest looking into renting bikes, and riding up/down the lakefront trail. You can either rent the streetside bikes (Divvy?) or look to a bike shop that would rent something nicer. The 20-mile or so lakefront path is the closest Chicago comes to natural beauty. The north end gets REALLY crowded on weekend afternoons. But it could be funb to bike up to Lincoln Park Zoo, or down to the Museum of Science and Industry.
I also enjoy just walking up/down Michigan Ave - say from the Art Institute up to Oak Street Beach. IMO really the best view of Chicago.
Maybe check out the new riverwalk - very nice. On a nice day it shows Chicago at its best.
Yeah, the river architecture cruise is pretty much mandatory.
I find Navy Pier EXTREMELY missable. And I’m not a fan of the Chicago Historical Society (or whatever it is called now.)
My favorite music bar is Fitzgerald’s in Berwyn. Depending on where you are staying and who’s playing, it might be worthwhile.
I read a review recently about a new book on “offbeat” attractions in Chicago. Forget the title/author, but there have been many. You might check a few of them out to see if anything catches your attention.