As far as leaving no trace, I always try to take an unorthodox path far away from a cache (when I leave) instead of the easy trail out so as to make it as challenging for the next cacher to find. When I get to within 50 or 100 feet of a cache, I carefully observe for evidence of disturbance to find a cache. This technique dosen't work at places like "Stacked on the Stillwater" or "Battleship". Your 'on your own' when you get there.