There's lots of good advice in this thread. I would add that I got tired of firing up the grill after a long, hot day on the grounds and now only bring breakfast bars and a bag of apples for munchies during the week. You will need a source other than onsite vendors for the first weekend. The coffee and bagels at the camp store provide a pleasant breakfast on the deck with other aviators from far and wide.
Kidventure is a pretty cool thing. The first 1,500 kids (I believe) to get their ticket punched for all the learning stations there get a free tool kit, just for participating. Sounds pretty perfect for a young aviation junkie. Speaking of the young aviation junkie factor, do make sure to make it to the seaplane base, especially if you can be there for the watermelon social. That will require getting tickets at the SPA booth in the exhibit buildings. And then there's the helicopter tours of the grounds....