Hiking in Colca Canon was the hardest hiking we have ever done. We started out on our four day trek to Llahuar then to Sangalle (towns at the bottom of the canon) with roughly 25 pounds on our backs because we thought it would be awesome to sleep under the stars and save on the cost of food by bringing our own. Which we did save a significant amount of money by camping and bringing our own food, but it also made the trek twice as difficult. On the plus side the star gazing at night was spectacular! And the canon was just beautiful and we recommend taking a trek through here, just maybe with less weight on your back!
Read more about our trekking experience and how we did it on our Peru page under travels!