Slide don't ride!
Its way more fun to shralp corners than the boring method of slowing down before the Apex and speeding out of the corner.
Never lend your tools or a tube to a stranger! Leave them stranded it's a good lesson for them . Only you should have a good time.
Don't stand in the middle of a trail . Leave your bike in the middle of the trail. That way people can see you have stopped.
Any hints on how to dry my undies when I change in the parking lot?