The bar at this Mayfair hotel earns high marks for tuxedo-clad service and a swanky setting (if the rhinestone-studded grand piano looks like something Liberace would have played, that's because he owned it!). Brass-framed mirrors, butterscotch-toned chairs, and tables appointed with white linens set the scene, and well-heeled patrons often meet at the close of day to discuss business and pleasure over fabulous cocktails and Italian fare. The Dorchester also features live jazz each night. Reservations are encouraged. TUBE: Marble Arch, Hyde Park Corner, or Green Park