Just as San Francisco's fog isn't for everyone, San Francisco's oysters aren't for everyone. Sure they don't look all that appetizing, and their slippery texture might take awhile to get used to.
But nothing says seafood like an oyster. Dress it up with some cocktail sauce, give it some crunch on a cracker, or, if you can handle it, try them straight up and call yourself a true seafood eater.
Recent history has only shown how passionate people out here are about oysters. Drake's Bay Oyster Farm, a beloved local institution, was put out of business after many years of wrangling with the National Parks Service about side-effects of oyster farming on the surrounding eco-system. Which side you took on this argument could easily decide who you would talk to for the next 10-15 years.
Although the closure of Drake's Bay was hard for those locals who love oysters, there are still plenty of oysters out there. Swan Oyster Depot has been serving oysters for generations, and Hog Island Oyster Bar is getting more popular by the day.
If you're wandering around San Francisco with a growling belly and just not sure how to satisfy your hunger, go with what a native would do. Grab a beer and some fresh oysters!