Recreation.gov
Make reservations at campgrounds, purchase tour tickets, and plan your trip to national parks and recreation areas. Also allows you to search for Federal recreation sites by state, agency, or recreational activity.
http://www.recreation.gov/
State Parks
Links to official state park sites for each U.S. State.
http://www.iloveparks.com/usparks.htm
Kumeyaay Campground
Meet the Campground Hosts. Activities around Kumeyaay. KUMEYAAY LAKE CAMPGROUND is open for camping on Thursday, Friday, Saturday, and Sunday.
http://www.mtrp.org/campground/
Camping – About.com
Guide to camping advice, outdoor destinations, campground reviews, recipes, and more.
http://camping.about.com/