If you didn’t have the right whiskey, forget it—Princess Margaret wouldn’t be spending long at your party. Tatiana Copeland laughs as she recalls hosting Margaret in Mustique in that gauzy heyday when the Caribbean island, part of St. Vincent and the Grenadines, held the reputation for being a hedonistic idyll—of the very exclusive, fabulously wealthy kind. Margaret’s preferred brand, allegedly the Famous Grouse, couldn’t be purchased on the island, which is just three miles long and one and a half miles wide. “You had to make sure you had it when she came to your house,” says Copland, an American who, together with her husband, has been going to Mustique since the 1980s. “If you didn’t have her whiskey then that was probably the last time she would go to you. If you couldn’t be bothered to know what she liked to drink, she probably wouldn’t be bothered to come back to you.”