The Popularity of the Inca Trail and the scarcity of available spots have led to the opening of several alternative hikes of varying length and difficulty.
The three to five day Salkantay Trek is named for the 6,270 meter (20,500 feet) peak of the same name. It begins at Mollepata, four hours by road from Cusco, and is a strenuous hike that goes through a 4,800 meter (15,700 feet) pass. The Salkantay excursion joins the Inca Trail at Huayllabamba. (http://www.incatrailmachu.com/en/travel-blog/hiking-to-machu-picchu)