Musée Mécanique

A private collection of more than 300 antique coin-operated arcade machines at Pier 45, including the Laffing Sal automaton from Playland at the Beach. Free entry. Bring quarters.

Exploratorium

A hands-on science museum at Pier 15. About 600 exhibits explore perception, physics, and the natural world. Founded in 1969, relocated to the Embarcadero in 2013.