"In Lilly's world less isn't more—more is more," writes Jay Mulvaney in Essentially Lilly (HarperCollins, $30), a guide to fashionable entertaining from the high priestess of Palm Beach style. Party planners (or armchair travelers) are sure to love Lilly Pulitzer's tales of the good life sprinkled among hostessing tips and fun recipes (s'mores, Bellinis).