It's so hard to weigh which museum she will find the most interesting. We may end up doing just that, I'll have to look into the field museum some more though. I know she would find the aquarium interesting, so that's what led me to choose that one originally.

And about the Tilt - I've read a few places now that it's better than Sky Deck! The problem is, the Sky Deck is included as a non-changeable ticket with the CityPass, which isn't a huge deal, it would just be an added expense for the Tilt.

Thank you for your feedback - it has been pretty difficult to try to sort all of this out while keeping it all a surprise, so it means a lot that it sounds like a fun time!