A few weeks ago Matt and I camped with some friends at Assateague (MD). It is an island near Ocean City that is a state park on the Maryland side and a national wildlife refuge on the Virginia part. However, the island is most well known for the wild ponies.
You are able to camp on the Maryland side and there are great facilities and campgrounds that include a picnic table and fire pit. For anyone that likes to camp, I highly recommend this adventure. Click here for information on the campgrounds and to find out how to book a site.
The activities on the island could include swimming, reading on the beach, walking, running, fishing, and much more. It is a perfect place for people that just love to lay on a nice beach and not have thousands of people, noise, and boardwalks.