Re: Weekend in Chicago. What to do?
I think Homer hit on pretty much everything I was going to suggest.
For the boat tours, they also have lake and river tours that go out on the lake as well as down the river rather than just staying on the river. I think it's an hour and half compared to the hour river tour. If you book in advance, get the sunset cruise, the skyline from the lake is quite a site at sunset. I recommend Wendella Boats but I'm a bit biased having worked for them one summer.
Depending on how old your daughter is, Lincoln Park Zoo is a nice attraction--and it's free. Just have to pay for parking as is the case anywhere you go in the city.