I had a great trekk to Machu picchu! . It has been fan to meet person you didn't see before and than going with them five days on a trekk, spleeping together in one tent even don' t know to communicate because you don't know the language of the other, walking in sun and rain, sitting in the gras next to each other after a hart day in the mountains.
After the trekk you will be like a small family, knowing each other very well, getting in to contact with people you maybe never would contact on your one.
Thank you for this great experience !!.