This will seem insane - this is one of those campgrounds packed in with dune buggies - but dangit if it isn't right off the ocean wind and waves, right off some green dune-y hikes and full of colorful characters while not feeling unsafe.  It's open and inviting, the best of a long series of campgrounds.  Get to bed on time and get up early, before the noise starts.  Stay here a couple weeks and write the next great U.S. novel.