Machu Picchu is accessible by at least 5 routes including Vilcabamba, Santa Maria, Inca Trail, Salkantay and Choquequirao.
Maras Salt Mines / Rafting to Machu Picchu 2 Days See the salt mines then raft to Ollantaytambo before taking the train to Machu Picchu. 
Choquequirao to Machu Picchu Trek 7 Days This is an epic hike in a class all it's own. You'll cross 2 mountain ranges and 2 rivers and see both Choquequirao and Machu Picchu. Tough hike with big payoffs. 
Salkantay to Machu Picchu Trek 5 Days Experience the ultimate change in altitude and climate zones. Trek through the Salkantay Pass surrounded by high turquoise lakes, glacial runoff and massive boulders before heading down into Peruvian jungle and Machu Picchu. 
Santa Maria to Machu Picchu Trek 4 Days Hike through the "Inca Jungle" to the hot springs before arriving in Machu Picchu with opportunities for biking, rafting and zipline along the way.