Nantucket, a tiny, isolated island off Cape Cod, Massachusetts, is a summer destination with dune-backed beaches. It’s marked by unpainted cedar-shingled buildings, many surrounded by manicured privets. The wharves and cobblestoned streets of the Town of Nantucket are lined with restaurants, high-end boutiques and steepled churches. The town’s Whaling Museum recounts the island’s role as a 19th-century whaling hub.