In the heart of San Francisco, in the Golden Gate National Recreation Area, is Aquatic Park: a small beach on a lagoon in the San Francisco Bay which is a historic swimming place and is still used and open to the public. The water is not pristine (and sometimes real cold) but some folks swim year around. There are at last two clubs (open to the public for a small fee) for people who swim here. For photos and information, see: DOLPHIN CLUB , SOUTH END CLUB. For other information see: GORP , FROMMERS .