A group of pioneers in the "green business' were getting back to their roots with a two-day hike through a pristine rain forest in Costa Rica when they hit Fer-de-lance Hill. "They' were aggressive and deadly snakes. "Sure enough, we round this bend and this fer-de-lance is rattling away at us,' recalled Mr. Newmark, the chief organizer of the hike and co-chief executive of the organic vitamin and supplement maker New Chapter. "It was about as thick as Albert Pujols's baseball bat.' One hiker, Stephen Brooks of Kopali Organics, was attacked, but his boot kept the snake's fangs from digging into skin. The trouble did not stop there. The hike was so physically taxing