If you're part of 1. , you already know that caching is a viable idea... not a joke, not just something for the "crazys", and definitely not neccessarily a hole in the ground.
If you're part of 2. , you'd better know how to use a compass before you turn on your G.P.S., be prepared to hump the trail when your S.U.V. breaks down or runs out of gas, and get a clue as to how to light a fire when your "JetFire MegaLighter" konks out.
And if you're part of 3. , be fore-warned, I've got my work boots on.

Troy