[Dangerous Doug]

I'd say take a side-trek to Sedona. On the way, stop at "Slide Rock" for your 16 year old son.

I think on Route 66 you'll find the road to the Havasupai Trail head. Havasu Falls (if you don't know what it is, Google it) is a short heliocopter ride away---takes off from the trailhead--- (okay, add onto that about a half mile hike through the sand). Sensational.

DD