CLASS II TO CLASS IV RAPIDS of the Green River etch a whitewater pathway from Wyoming's Wind River Range through parts of Colorado and Utah. Rock as ancient as 1.3 billion years stands stoically under a bright blue sky. Amid red rock cliffs topped with B Y DAV I D T U L I S PHOTOGRAPHY BY THE AUTHOR aopa.org/pilot AOPA PILOT | 69http://www.aopa.org/pilot