He scrutinized maps and a detailed timetable. He even deployed a secret weapon: artificial-intelligence research to chart a course through death-defying drops, torrents of water and fiery heat. And when this adventurer clambered out of a floating log last year, he had reached his holy grail: visiting -- in a single day -- each of the 41 operating rides, attractions and shows at the Everest of theme parks, Walt Disney World's Magic Kingdom. "It was a challenge, and I loved the idea," said Vosburgh, 45, an information technology manager for Dell Computer Co. in Austin, Texas. "There are a lot of things at Disney World that I had not done. Why would I go on teacups when there are mountains to ride? This way I was forced to try everything."