DELMARVA is known for its beaches along the eastern barrier islands. The best known is Ocean City, Md. with 3 miles of boardwalk, wide beaches, hotels, shops, and restaurants. See http://ococean.com/ for all the details.
Travel north from Ocean City into Delaware and visit Fenwick Island and the lighthouse. A small jaunt further north reveals Bethany Beach, Dewey Beach, Rehoboth Beach, and Lewes, where one can take the ferry across the Delaware Bay to Cape May, New Jersey and on to Atlantic City for some gaming. See http://www.visitdelaware.com/beaches/