Leave No Trace
What is Leave No Trace?
Wilderness ethics dictate that visitors to the area try to leave no trace of their passage. While not regulations, the seven Leave No Trace principles will help you get the most out of your wilderness experience, and help you to preserve the park's unique values for other visitors, both today and in the future.
Leave No Trace extends the National Park Service mission to you and challenges you to "…conserve the scenery and the natural and historic objects and the wild life therein and to provide for the enjoyment of the same in such manner and by such means as will leave them unimpaired for the enjoyment of future generations." Link to http://www.lnt.org
Leave them unimpaired = Leave No Trace