If you are STAYING at the campground and a bounce back offer is in effect, then yes even as a campground guest you can book whatever bounce back offer there is.
For example, in Dec 2006 there was a bounce back offer for free dining. We were staying at the Fort. We went to a desk they had set up at the Beach Club lobby and made our reservations for Pop Century for Free Dining for Sept 2007.
Every time we have stayed at a resort, there seems to be a continual % off bounceback offer sitting on the table. I have never called the number to see if the Fort campsites were included, but it wouldn't hurt to ask.