I highly recommend going if you ever have the chance. The grandstands don't fill up like they do for the Daytona 500, but the majority of the people in the infield are very knowledgeable about cars, and there are lots of various car clubs and organizations that have pretty much mini car shows. It wasn't that much to get into the infield, but as far as getting access to the garages and pits, it helped to know one of the drivers.