Bob, there will be a sign, usually a mile or so past the pits that says "no spectators beyond this point." You do not really need to be in the recovery area, you will see all you want. You can walk the pits, drive outside the pits, be at the start line if sign the waiver and get an arm band.
If you need to be more involved, there are usually opportunities to help. Talk to folks, it is a friendly atmosphere, just pay attention before disturbing someone that is struggling to get their vehicle working... Thrashing is not usually conducive to conversation... guys sitting in chairs always is.
Have fun, stop and see us, come to Salt Talks, buy lots of t-shirts....