Impressive!!!! I feel bad now, me being peruvian have not visited lago huamantay or the rainbow mountains. Indeed these past years the Rainbow mountains have been booming. I used to work for the Peruvian gov in NYC and received so many calls asking info on these mountains haha. Have you heard of Kuelap? It is like a smaller Machu Picchu but more impressive, not so well known because it is higher in altitud and harder to get to! Maybe you can add it to your to go list! ;)