From Baltimore take Route 97 south to Annapolis.  At the Route 50 interchange follow Route 665 to the first exit on Riva Road.  Follow Riva Road approximately 5 miles to entrance to the park on the left (if you reach Route 214 you have gone ¼ mile too far). 

From Washington and Annapolis take Route 50 east or west respectively to Route 665 and follow the directions above.