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Photo: Ann Bartkowski / Dacreep at en.wikipedia, CC BY-SA 3.0 via Wikimedia Commons
Along the Embaradero in between the Ferry Building and Fisherman's Wharf, The Exploratorium was the first interactive science museum in the world, and remains perhaps the best. The converted pier is filled with intriguing interactive experiments about nearly every branch of the natural and social sciences. If you're lucky, they'll conduct one of their most famous (and fascinating to most children) demonstrations: the dissection of a cow eyeball. The exploratorium also includes the Tactile Dome, a maze that you explore in pitch darkness, using only your sense of touch.
The Exploratorium is a museum of science, technology, and arts in San Francisco, California. Founded by physicist and educator Frank Oppenheimer in 1969, the museum was originally in the Palace of Fine Arts where it founded Pi Day in 1988. The museum relocated in 2013 to Piers 15 and 17 on San Francisco's waterfront.
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Information on the island can be found on the National Park Service's website.
Bay tours under the Golden Gate Bridge and private charters and parties with full catering.
A nice place and the right size for kids, with an underwater tunnel, where the fish swim above you as you gaze at them, and ponds where you can touch various live marine animals. It's a perfectly decent aquarium, but many locals would recommend you save your money for the fantastic California Academy of Sciences in Golden Gate Park.
This is an exciting bungee/trampoline combination, suitable for all ages, which allows you to experiment with the dare-devil acrobat inside of you. It's possible to reach heights of up to 20 feet in the air.
In addition to their bay cruise from Pier 39, Blue & Gold Fleet offers ferries from Pier 41 across the bay to Sausalito, Tiburon, Angel Island, and Alameda/Oakland. Blue & Gold Fleet also runs a "RocketBoat", a high-speed cruise of the bay in a sleek red boat.