Race: Payette River Games, Cascade, Idaho
The Race: A $25,000 prize draws some of the world's best SUP boarders (and 30,000 spectators) to paddle in a three-day combined competition. Between heats, competitors lounge in a riverside hot tub, play beach volleyball, nosh on grass-fed barbecue, or join in on the logrolling and ax-throwing competitions. Most people camp on-site (free for athletes) and celebrate the river they spent battling at the end of the day.
When: June 19–21
The Place: Kelly's Whitewater Park has Class III–plus rapids and is surrounded by snow-capped peaks.
Don't Miss: The fetch competition, in which dogs vie to be the fastest retriever in the water.