Go West on Rt 33 toward Hightstown.  After you get past the Golf Driving range on the right, a half mile or so past signs for Quail Ridge Boy Scout Camp, look for a Lobster Shanty on your right.  It is at a light.  Take a right and follow the road until you get to Monroe HS on your right.  Just past the high school is Thompson Park.  the wide open fields is where the race is.  Skip the road between the high school and the park and go up to the first exit into the park.  The start will be on your right.  Drive in and park.