Nothing signifies getting away from it all quite like an island visit. Whether it requires a five-hour ferry ride or a quick trip over a causeway, the very act of separating from the mainland is also a separation from the everyday and an invitation to explore. We’ve gathered together our favorites—both classic destinations and little-known treasures—in the continental U.S. and Canada (plus a few in Europe for good measure). All offer the possibility of an idyllic summer retreat distinguished by natural beauty, alluring beaches, historic charm, and above all, the chance to recharge.