Start your hike where the AT crosses Raven Rock Road (MD-419). This crossing is well-marked from both sides by large, yellow signs and blazed stakes. You will need to park on the side of the road, but the shoulder is wide and can accommodate a crowd. 

The first half mile or so of this hike is hard; you'll be climbing more than a thousand feet up uneven stone steps and switchbacks. Luckily, it's immediately scenic as you meander through Raven Rock Hollow, a large outcropping of boulders overlooking South Mountain's eastern edge. 

At about one mile, you'll come to a side trail to your left for the devils' racecourse shelter and another side trail to your right for a spring and Ritchie Rd. Follow the trail to your right. It will lead you downhill and across a spring. Soon you'll come to a tree with a black blaze. Just beyond that is Devil's Racecourse, an impressively large boulder field in the middle of the forest. 

Listen to the creek as it flows beneath the rocks and snap a 'gram (or 70) before retracing your steps back to the car, or on to High Rock.