For serious athletes who want to race uninebriated and uninhibited by costumes, the annual Escape from Alcatraz Triathlon is the best bet. The summer race starts at Alcatraz Island when competitors jump from a boat for a 1.5-mile swim, continues with an 18-mile bike ride along the Great Highway, and ends at the Marina Green after an 8-mile run. To compete, racers must qualify through a triathlon series or be subject to a lottery system. If this scenic triathlon is not your speed, feel free to watch the 2,000 triathletes sweat it out over the course of the race, and then head to the finish line and sample the free energy goodies at the Fitness Festival & Expo.