Same story here as for the Coyote Butes - Saw this last October on the way South but lost the camera with the card in it in Mexico so I'm back to take a few more pictures on the way North.
This slot canyon near Page in Arizona is absolutely stunning. Its a bit difficult to take good pictures with good colour saturation, and my camera is really just a point and shoot consumer model. But the biggest reason for the limited quality is that I just didn't seem to care as much as I thought I would or as I did on the way South.