The extreme Ironman World Championship triathlon takes adventurous types through lava fields and across Kailua Bay in Kailua-Kona. You have to qualify to take part which means this event is purely for the creme de la creme of triathlon competitors.
Ironman participants must stay the course of a 2.4-mile rough-water swim, a marathon run (26 miles) and a bike ride of 112 miles. If you don't fancy entering yourself, there is excellent viewing and a party atmosphere at the Kailua-Kona Pier start and finish lines. Ironmen from countries all over the world compete and there is a colourful parade before the race commences.
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