The Yerba Buena Gardens are diverse and beautiful but with small children along you'll be heading for the rooftop, where an eclectic mix of entertainments wait to steal your whole afternoon.
Features up here include ice skating and bowling facilities, children's carousel and a child sized labrynth. They offer 2 adventure play areas, one with interactive water features the other with 25ft tube slide, sand play and giant xylophone.
The Children's Creativity Museum (listed separately) is also here.
And once they're exhausted and content to just look, you might actually get a walk through those luscious gardens we mentioned!
$4 for carousel
There are granite game boards for chess, checkers and the like, but you must take your own pieces!