We have been to the Field Museum before and most likely we will go again. My boys love the Dinosaur exhibit and now have become BIG fans of the World of Mammals and the Mammals of Asia exhibits as well!
We go on free days and have discovered that the best parking is right next to the museum in between Field and Shedd. It is a tiny bit more expensive, but totally worth it not to have to walk out in the cold with two children.
It was a great day and I love seeing my boys so engrossed in educational activities and historical artifacts. They simply absorb everything about their surroundings when they are at Field. It is a lot of fun to watch.