Ferries leave from Penzance for the Isles of Scilly, a group of 100-plus mostly uninhabited rocky islands. Warmed by the Gulf Stream, they feature unspoiled beaches, exotic palms, and swarms of rare sea birds. You'll even find world-famous subtropical gardens on the island of Tresco. West of Tresco is Bryher Island, the smallest of the archipelago's five inhabited islands.