Think of summer drinks, and frosted glasses of iced tea and lemonade spring to mind. Here, grown-up versions of warm-weather favorites: The Lemon Drop at the Federal List bar in Boston's XV Beacon combines Absolut Citron, lemon, Cointreau, and a splash of Sprite. Try a Dreamsicle-like Summer Fling in the Redwood Room at San Francisco's Clift—Smirnoff orange, coconut cream, melon purée, and orange juice. In Seattle, Oliver's at the Mayflower Park Hotel pours a Grape Nehi, named after the classic soda—vodka, Chambord, triple sec, sweet-and-sour, and lemon.