Hey, I think there's already a Rockleigh thread...but...
Yes, I know the best way.
Start from the GWB in New Jersey. Head out on the traditional group ride route. Drop down to the "low road," ride straight until you hit the course, turn left. If you pass the New York state line sign, you've gone too far by about 15 pedal strokes.
Thanks Marc. Managed to hook up with someone heading up there from the GWB. Fun race with a lot turns and opportunities to attack. Starting like this crit racing : )