Things to do in Chicago

[forgop]

Looks as though my family will be headed up to Chicago the weekend of July 4th to visit friends in Roscoe (~70 miles west of Chi-town?). Our plan was to head up and spend Thurs evening through Sunday morning with them and then head to Chicago for some stuff to do with the wife and kids(who will be 6, 4, and 2 at the time). We'll probably stay in Chicago and get a room on priceline and have Sunday-Wednesday in town before coming home.

I came across this and it seems like a great deal. http://www.citypass.com/city/chicago.html My initial desire was to hit the Field Museum and Museum of Science and Industry as it was, so that accounts for Sunday/Monday. On Tuesday, we'd probably hit the Shedd Aquarium and Planetarium.

On Wednesday, it's an early afternoon baseball game at Wrigley (haven't been in over 25 years I bet) with free tix as the Braves are in town Monday-Wednesday that week.

Anything else you'd recommend over anything I've suggested above? I don't want to waste my time with the planetarium if you think it's too old for them to really understand anything from it.