If there's one good-time destination that's an anchor for San Francisco's party people it's Embarcadero's Pier 23. Part patio spot and part dance floor with a heavy dash of dive bar here it's all about fun for a startlingly diverse clientele. The well-worn box of a restaurant and tented patio is prime sunny-day social spot for white collars, but on weekends, it's a straight-up people zoo where every age and persuasion coexist more peacefully than the cast in a McDonald's commercial. Expect to boogie down shoulder-to-shoulder to 1970s hits and leave with the contagious feel-good vibe.