[astroAPhi]

I agree with Rudey that Navy Pier isn't much fun in the winter time, unless you want to see an IMAX movie or do some shopping. That's honestly about it. However, you CAN park there. We've done it as recently as this past May.

I would advise checking out the Museum area. I personally recommend the Field Museum and the Shedd Aquarium. While the Adler Planetarium is cool for observing and lectures, I'll admit that the displays are pretty cheesy. It is a beautiful building however, if you want to admire the architecture.