1. Escape to Alcatraz: The Dolphin Club
You can kayak, row, or brave the cold bay waters as a member of The Dolphin Club. Along with the South End Rowing Club, the club heartily encourages no-wet-suit swimming and hosts several year-round events including twilit swims and the Escape from Alcatraz triathlon. They also operate hot showers and saunas for your post-swim recovery.
502 Jefferson St., The Marina (415-441-9329).