Jump into Downtown’s entertaining fray. Union Square shoppers, FiDi workers and culture junkies crisscross the city center at a brisk clip. Fist pump your way over to Ruby Skye’s thumping dance floor, hang with the theater geeks at S.F. Playhouse, or get a plateful of prime beef at Leatherneck Steakhouse. Night or day, work or play, this non-stop neighborhood never quits.