Waikiki Roughwater Swim
With hundreds of flailing limbs splashing in your face, this 2.4mile ocean race should be good practice for the swim leg at October's Ironman Triathlon World Championship.
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Held in Lower Trestles, Calif., this is the WCT tour's only stop on the U.S. mainland. After four of nine events, Andy Irons (right) leads Kelly Slater by 1,500 points.
Odyssey Off-Road Triathlon
Last year Kristin Eddy of Reston, Va., led all finishers--men and women--to take the overall title in this Ironman-distance event run through Virginia's Allegheny Mountains.