Entertaining a two year old in Chicago?

Going to Chicago with my two and a half year old daughter, want to do some fun things with her. Already know about touristy things like Sears Tower and Millennium Park but I was hoping for something more kiddie. There was a place called Kiddieland but that's closed now, but something along those lines...teacup or train rides, maybe just an awesome little playground, even a great pool (she can swim on her own).