I ran across this post after 9 months and wanted to correct some obvious (mistaken) choices on my behalf.
First off, I should have taken the longest zoom I had on hand. At least 90% of my shots ( if not all) could have been done with a 28-105. My 210mm zoom would have been preferable.
Second, 50mm and 35mm lenses are fine for large indoors areas, street shots, or buildings.
Third, I thought that I could get close to the petroglyphs, but nooooo, aint gonna happen what with railings keeping one back. Plus you cannot go off the trails, and everything is not close, and the glyphs are hard to see. Well,, try try again. At least I came away tho with some good shots tho..