Yes, San Francisco CityPASS is worth it. You'll get 5 top things to do at a discounted price: regular adult prices for 3 attractions instead of 4 (SF Zoo + Aquarium of the Bay combo ticket, Exploratorium ticket, and Palace of Fine Arts ticket), more savings on the California Academy of Sciences and up to $7 off admission on Alcatraz Cruises and Blue & Gold Fleet Bay Cruise tours with your pass purchase.