** ADVANCE FOR MONDAY, SEPT. 3 ** Jamal Davis, left, and Pedro Sarmiento, rear, hike along a trail June 5, 2007, in Yosemite National Park, Calif. Sarmiento started participating in WildLink trips in 2003, and now comes as a chaperone. "More kids should experience this at least once in their lives," he said. (AP Photo/Gary Kazanjian)