This place is huge!
I was just here recently for the SEMA convention and while I wasn't here throughout the entire week long festivities, the two days that I was there was plenty enough to cover what it was I wanted and whom I wanted to see.
Several large halls hosted all kinds of vehicle parts and pieces. Be sure to bring plenty of business cards for those networking opportunities. The food court options were not an option for us as they seemed to be overpriced and uninteresting. Besides, why dine there when just several blocks over are world-renowned michelin-starred restaurant to satisfy your appetite and or ease up on your wallet. We opted to go outside of the convention for our meals and coffee.
Convention center parking was reasonably priced and included in's and out's for the length of the day's event. At $10 a car this allowed for some time spent at the show, outside eats/drinks/gambling and a return to the convention, if you so choose to do so. A great deal considering neighboring lots were charging up to $40 a car and the parking environment was no different.
Note: we did lots of walking, even up and down escalators that didn't work. Wearing comfortable shoes is a must!