Cape Cod's Coast Guard Beach makes waves: One of top 10 in U.S. Pop the corks and fill your sand pails--Coast Guard Beach in Eastham is among the top 10 beaches in the United States, according to coastal expert Dr. Beach. Some know Dr. Beach as Stephen P. Leatherman, a professor of earth and environment at Florida International University. He has released his list of America's best beaches since 1991, and Coast Guard Beach has often made the cut. This year, the Cape Cod National Seashore strand was ranked number 10, with number one honors going to Hapuna Beach State Park in Hawaii.