Cool scene.  In Bryce, an easy way to turn down the saturation when the sun is the only lighting is dull down the sun's color from the usual white. 

I will always stand by what I have said here many times.  Lower the sun's postion closer to the horizon and to the side of the scene.  This will elongate shadows and add to realism.  Photographers learned that long ago. That plus softening the light color will give you that "golden hour". 

This last suggestion will make longer render times sadly, but is a neccessary evil. Soften the shadows a bit.