To leave an area in the same or better condition than you found it.
The exception to the rule here would have to be in the rare and unique circumstance where you are building new trails with landowner permission and cooperation...
Oops (edit) I forgot to answer the second part of the question...
And have even gone so far as to suspend relationships with people who just don't get it - after explaining it over and over and over again...
aka "Pistons Chick"
Region 3 - WA Land Matters
Club President 2007 - 2014
Piston's Wild Motorsports
PNW4WDA Member for 25 Years
"SARCASM - because beating the crap out of people is illegal."