Like cable TV? Here's a reason why it works. This is a virtual cache (finding it is its own reward!). As stated above, you are looking for a set of black numbers on an orange background. Email me the numbers to confirm your find.
You might want to visit this cache to score some points even if you can't solve Tour de Keystone (GC5143).
4/2015 update: In response to comments, I have upgraded the difficulty and terrain ratings.
Also, if you start on the correct side of the creek, you will not have to cross it. Seems obvious, doesn't it?
Npprff sebz gur abegu vf zhpu rnfvre guna sebz gur fbhgu, juvpu unf zber punyyratvat greenva. Gur pnpur vf rnfg bs gur perrx.