The following San Francisco attractions have major appeal to kids of all ages:

Alcatraz Island

Cable Car Museum

Cable cars

California Academy of Sciences, including Steinhart Aquarium

The Exploratorium

Golden Gate Bridge

Golden Gate Park, including the Children's Playground, Bison Paddock, and Japanese Tea Garden

Maritime Museum and the historic ships anchored at Hyde Pier

The Metreon Entertainment Center

The San Francisco Zoo

In addition to the sights listed above, a number of playgrounds are of particular interest to kids. One of the most enormous, fun playgrounds for kids is in Golden Gate Park. Apartment buildings surround the Cow Hollow Playground, Baker Street between Greenwich and Filbert streets, on three of four sides. The landscaped playground features a bi-level play area fitted with well-conceived, colorful play structures, including a tunnel, slides, swings, and a miniature cable car. Huntington Park, Taylor Street between Sacramento and California streets, sits atop Nob Hill. This tiny play area contains several small structures particularly well-suited to children under 5. Julius Kahn Playground, West Pacific Avenue at Spruce Street, is a popular playground inside San Francisco's great Presidio Park. Larger play structures and forested surroundings make this area attractive to children and adults alike.