SF STANDARD - We all know that (possibly apocryphal) Mark Twain quote about what summer is like in San Francisco—for three straight months the thermostat reads a winter-like 56 degrees, while a cryo-bank of fog rolls down the hills. Well, if you’re itching for some actual warmth, grab your bucket hat and your folding chair and put a bunch of chilly daylight between you and the socked-in 7×7. We’ve pulled together 11 of our favorite swimming spots outside of the city to inspire some SPF-coated adventure.