Blue and Gold fleet for $12 (regularly $24 for aduls and $16 for kids). It's a one hour narrated cruise taking you by the Golden Gate Bridge, Alcatraz and the SF skyline.
To get the deal, click here: Find Today's Daily Deal on the Best in San Francisco! The deal is good through Sunday, but you must use it by September 7, 2010.
And when you're back on shore, here are some family-friendly, fun activities:
Three Cheap Wharf Attractions
Aquarium of the Bay
Pier 39's Mirror Maze
Small print: Groupon is a Frisco Kids affiliate, which means if you make a purchase using this link, Frisco Kids makes a small commission. We only post things we think you would like, though.