Just got back from the Salkantay Trek and I'm still trying to process the stunning views. If you're planning to tackle this trek, I highly recommend taking it slow on the first day. I see a lot of people rushing to get to the high camps and paying for it later with altitude sickness. If you're going to do the Salkantay, take your time and acclimatize properly in Cuzco and Aguas Calientes before attempting the pass.
