At the trail head, you'll find a posted map. There are usually maps in the mailbox at the trail head sign too. The trail is primarily single track. The main loop, which is well marked with red hash's on the trees and mile markers, is twelve miles that takes you through a pretty well maintained singletrack. The trail is considered pretty rooty (as described by some who have rode several more trails in this area of SC than I have). I didn't find the trail technically challenging. However, it's a good workout trail and there is enough scenery to keep the ride interesting.
I haven't seen "him" yet...but I understand there is a section of trail on a berm where one or two aligators like to bask in the sun :O....
There are two (or three) alternative routes that cut the ride a bit shorter (to about an 8 mile ride). These "short cuts" are marked in blue. As I discovered, after a good rain, you'll want to cut the back area of the twelve miles off and take one of the alternative routes, as that area is dubbed "The Amazon Swamp" for good reason. Although the area isn't impossible, the ride is not enjoyable due to deep mud (not to mention how it ruins the trail) It does look as if who ever maintains the trails are looking to remedy the trouble area's by raising the trail and putting down a one foot thick sand base over the worse area's.
There are a few jumps, berms and possibly a "pump track" near the last three or so miles for those of you who want a bit of "Free Riding" or BMX style riding...
From Hwy 26, take Exit 205 North (Hwy 78 or University Blvd.). When you come to Hwy. 52, stay to the left (follow signs to Charleston Navel Weapons Station). Turn right on Snake River Road. Follow it into the Naval Weapons Station (there is no guarded gate at any point in my directions, however, you will be on the base, so act accordingly).<br /><br />You'll pass a few roads on your left including a water treatment plant. On your left (only way you can turn) you'll see a sign for Marrington Trails Wilderness Area. Turn left and enter the gate. The trail head parking in about 200 feet on your right.
http://www.singletracks.com/item.php?c=1&i=1751