National Park Service Cape Hatteras National Seashore
http://www.nps.gov/caha/index.htm
Here is information on camping:
http://www.nps.gov/caha/planyourvisit/campgrounds.htm
Need a beach permit? You can get one at the NPS Visitors' Center located near the Swan Quarter/Cedar Island ferry...
Ocracoke Preservation Society
If you have any interest in Ocracoke's rich cultural history, the Ocracoke Preservation's Society David William's House Museum is a must see when visiting...