Parked at Sheperd Lake, and followed the Mt. Bike Loop around the south end of Potake Pond. Threaded the maze of woods roads toward the base of Bald and bushwhacked up the west side. Took the long way down to visit the famous ruins, then back the way I'd come. Found NY/NJ Boundary Marker 19 just off the trail.
$5.00 to park at Sheperd Lake (weekdays), but a nice place to swim after a hot hike.