My wife and I had the good fortune to score credentials a couple years ago through a friend at work. We only had one day to spend, Friday, as we were at the end of a hiking vacation in Utah. I can't comment on the activities at the track, we didn't go. (Attended the national drag race the Sunday before heading to Utah.)
My recommendations. Plan on spending more than one day. The show is huge. We skimmed through a lot of it due to limited time. The main floor is a who's who of the aftermarket industry. Take as much advantage of being able to talk to these people as possible. That part of the experience was really cool. Their all car guys! Wear comfortable shoes!!