A few days ago I had the privilege to see Machu-Picchu (Peru) and I burned lots of film!
One piece of advice: the light is truly magical around sunrise.
Also, there are hardly any tourists - the big buses arrive aeround 10 am.
So, I’d recommend to be in Aguas Calientes the day before visiting the ruins, taking the bus at 5:30 am. Even before sunrise, the sky was remarkably bright and I could easiliy take picture with my 50 mm lens (1:1.4) and shortly after with the normal zoom (Minolta 24-85).
PS: when I left the site, two Viszcachas were sitting on the main entrance, but none of the tours saw them! Watch out for little humming birds as well!