From the Hamburg Reservoir Parking lot follow the crushed stone road until it makes a hard right, walk straight up the grassy hill and past the gate.
The lake will be on your right side, take the first left hand trail you come to (watershed trail)
Follow this trail until it T's on the Appalachian trail, turn right
Follow the white blazed Appalachian until you reach the Pinnacle vista
Continue to follow the AT around the loop until you get to Pulpit Rock Vista
With Pulpit Rock at your back walk straight to the observatory grounds then follow the trail then paved road down until it comes to a T
Turn left and follow this back to the parking lot