An additional tidbit that I just remembered about the NP. When we got there, they were digging out some of the sites in loop 1. The sand had drifted over the tarmac parking spots and they were using a Bobcat to push the sand back. I got to talking to one of the workers and he said that they were closing the ocean loops and moving them across the road because it was getting too hard to keep them open. If you want the full on-the-beach Assateague experience, you'd better get it in this year. My guess is they'll close the beach front sites before they build the site across the road, so it will probably impact availability for next season.