Using the Trail from Camp Rodney :

If you are leading a group of Boy Scouts, this is a way to get onto the Elk Neck Trail if it is not hunting season. Hike up the road to the left of the Bull Mountain Wilderness sign. This will lead you past a group of three buildings. Eventually there will be another road going up the mountain, but just keep walking. You will come to a gate. Immediately across the gate is the Elk Neck Trail to the right, where you will see an icon. 

However, boy scout troops can remain on the grounds of Camp Rodney and turn right before the gate. The following instructions are for that. Follow this well marked trail until it starts to angle right and there is a grassy path to the left, but you then turn left. At some point soon you will merge into the Elk Neck Trail. Then keep following the trail icons.

You will eventually come to a large open field. The trail follows the left side of the trail and you should plan to come out on the road to the right of an old foundation, where you will see more trail icons by what looks like an old driveway.

Crossing over the road, you will see a wide mowed path leading to the right. Follow it onward and you will see icons when you are back in woods. Follow them along the way.

The rest of the trail south from Camp Rodney is fairly straightforward, except for when you arrive at the Beach Area Road. There, turn right onto the road and walk just past the pavilion on the left.  Turn left at the very next road. This goes up into a parking lot, from which you will see a road heading up to an oval paved area. At the very end of the oval you will find a lighthouse icon pointing the way onward into the woods again.