Take the Garden State Parkway South to its southern end.

Continue south on Route 109, Proceed stright through 2 traffic lights, and over the Cape May Canal Bridge into Cape May. At the base of the bridge you will merge into one lane. South Jersey Marina is on the left, just past the Lobster House Restaurant sign.

From Philadelphia:

Take the Atlantic City Expressway to the Garden State Parkway, Exit 7S.  Take the Parkway South and follow the directions above.