I have included Florida, Georgia, Maryland, North Carolina, South Carolina, Virginia and West Virginia in the South Atlantic States. These State Parks and Forest have a nice variety of ATV / OHV Parks.
Florida has Division of Forestry Tate's Hell State Forest. Off Road vehicles and and all-terrain vehicles (ATV's) have more that 150 miles of designated trails on existing forest roads. Trails have assorted ecosystems including cypress/titi swamps, blackwater rivers and pine flatwoods. For more information call: (850) 697-3734 or Email: Tate's Hell State Forest or check out this websites. http://www.fl-dof.com/state_forests/thsf_ohv_index.html
The Withlacoochee State Forest in Florida has a ATV / Motorcycle Area - Croom Motorcycle Area: Buttgenbach Mine Campground. The Croom Motorcycle Area is 2600-acres and campers may ride from the campground into the surrounding off-road riding area.
There are 50 campsites with electricity- no pets allowed- designated for off-road motorcycle and ATV (all-terrain vehicle) use.
State park rules require your ATV to have a Maryland Department of Natural Resources off-road vehicle permit that costs $15. All riders are required to wear a helmet and eye protection. No riders under 12 years old. Three Wheel ATV's are not allowed in any of Maryland's trails.
Check out this website for North Carolina's ORV area's. http://www.ncnatural.com/NCUSFS/
The South Pedlar ATV Trail System is open to four-wheel ATVs (no 3-wheel) , motorbikes, and mountain bikes. The trails and terrain is full of variety. South Pedlar trails include: Terrapin, Rattlesnake, Piney, Otter, Lone Mountain and Lasso. There is a $5 per day fee, helmets are required and no children under the age of 12 are allowed on the trails.
Peters Mill Run and Taskers Gap Off-Highway Vehicle (OHV) Trail complex in Edinburg, VA and Tasker's Gap ATV/OHV complex. Contact the Lee Ranger District, 109 Molineu Road, Edinburg, VA 22824 Telephone: (540) 984-4101 http://www.fs.fed.us/r8/gwj/lee/recreation/ohv/index.shtml