The Exploratorium practically invented the hands-on science museum, and hundreds of tinker-with-it exhibits about light, sound, and perception still make it one of the most playful spots in the city for all ages. Its waterfront pier location means you can pair a visit with a bayfront walk. Grown-ups should note the 18-plus After Dark evenings on Thursdays, when the galleries turn into an adults-only playground.
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Pier 15, Embarcadero at Green Street · hands-on science and perception museum · Tue-Sat 10am-5pm, Sun 12-5pm, closed Mondays