We have been attending expo for the last 6 years and have always had a great time. While last year was the weakest of all the ones we have attended, there is still so much to do and so many people to meet. Walking around the vendor hall is my favorite part. I love checking out new parts/mods and meeting people who have worked on their own machines. The free play area is fine, but its the other aspects of this show that make it so unique and worth the trip.
Also, just a couple of food suggestions. Just down the street is Rise and Dine. Their breakfast is awesome and we eat breakfast there EVERY MORNING of the expo. Dont miss the Italian Skillet. So good.
Superdawg and Portillos have great chicago style hot dogs and are within a few miles of expo.
Lou Malnatis deep dish pizza is great as well. Its only 5-10 minutes away from expo. Make sure to bring some friends because its hard to even get through 2 slices.
Have fun!