On Thursday, I attended the San Francisco Maritime National Park Association's 60th birthday bash. I'm a new member, and so I'm just beginning to learn about this little gem, and the maritime history of SF.
The park includes that bad-ass ship you see at Hyde Street Pier (in the photo at the bottom of this post), a submarine you can go into, and a museum in the art deco building at Aquatic Park with jaw-dropping ship models and other miniaturizations.
The inside and outside of the Aquatic Park Bathhouse Building are covered with awesome WPA-era murals and mosaics.
Learn all about the association and the park here.
Beware: Polar Bears often swim in adjacent Aquatic Park, so if you're sensitive to seeing half-naked old guys who like to maximize "shrinkage," look away - ooh, what a pretty ship!