Students, faculty and staff collaborate to bring new signage and geocaching tours to O.O. Denny Park in Kirkland, Washington. As any good outdoor enthusiast knows, the first rule of exploring nature is: “Leave no trace.” There are, however, the occasional exceptions to this principle — such as when small, human-made additions to wild places raise awareness about conservation and other environmental issues. When Ash Putzke spent their summers as a kid catching salmon fry at the mouth of Denny Creek…