From 95 - take 95 to Prince William Parkway towards Manassas - take a left on Crossing Place.
Drive to top of the hill and at the stop sign take a right on Research Court.
Drive through the culdesac until you get to a fence with boats behind it.

From Manassas - take Prince William County Parkway towards Potomac Mills.  Take a right on Crossing Place.  Drive to top of the hill and at the stop sign take a right on Research Court.  Drive through the culdesac until you get to a fence with boats behind it.