My wife and I just completed a 5 day Salkantay trek and it was an absolutely wonderful experience.
Throughout the entire experience the guides were incredibly helpful and knowledgeable, and honestly just really fun people. The trek started with a semi hard, but beautiful hike into a lagoon right underneath a glacier. Some people went swimming!.
The second day was one of the most difficult but memorable days of the trip. We hiked through the pass of Salkantay. High altitude combined with lots of uphill made this day a challenge, but the reward at the top of the pass was incredibly beautiful.
The following days were beautiful - hiking through Peru's jungle. Finishing the trip in Machu Picchu was simply icing on the cake. All in all, a wonderful trip with views we'll never forget and wonderful people.
I'd highly recommend !!.