From the Sunnyvale Mountain Parking Area along Skyline Blvd (2 miles South of the Castle Rock parking area), head North along Skyline Trail. Follow the trail as it runs parallel to Skyline Blvd (you’ll hear but not see the road), then continue right to stay on Skyline Trail at a junction. You’ll pass a picnic table after about 0.5 miles and see old wood and stone fences. At the junction with Sanborn Trail, turn left to stay on Skyline Trail. Follow Skyline to the right, avoiding a roadside pullout and stairs to the left, continuing towards Indian Rock. Turn back when you reach the parking area (this is the parking area nearer to Castle Rock).