You may carefully (watch for potholes!) park here at this beach park, or turn right at the small dirt road and off-road it until you must park in the grass to avoid driving through private property.
From the Navy Base, Drive North up Marine Corps Drive. You will pass the turn for Polaris Point, the Port Authority, and the Guam Power Authority Piti power plant on your left. Soon after the stop light for the power plant, keep a lookout to your right for J.M. Tuncap Street.