** ADVANCE FOR MONDAY SEPT. 3, 2007 ** Jorge Castaneda, left, and Jamila Chandler clinch their hands together before a hike Tuesday, June 5, 2007, in Yosemite National Park, Calif. Castaneda was on his first backpacking trip while Chandler has been on countless trips and helped chaperone the Yosemite WildLink expedition. (AP Photo/Gary Kazanjian)