There is always something happening at Kailua Pier, with boat tours and fun cruises departing throughout the day. For sports fans, the granddaddy of all endurance events - the Ironman Triathlon World Championship begins right here each October. Starting at the seawall by the pier, 1,800 highly trained athletes swim 2.4 miles in the ocean, bike 112 miles in the blazing sun, and finish it all off with oh, just a simple little 26.2 mile marathon run. It is an amazing test of endurance that can only be witnessed once a year on the Kona Coast of the Big Island of Hawaii.