This region is a paradise for walkers and hikers of all fitness levels. Around the main Machu Picchu Citadel, you can take a relatively easy walk to viewpoints like the Hut of the Caretaker of the Funerary Rock, climb stairs above the ceremonial baths section to the Sacred Plaza, or do a hike/walk combo up to the Sun Gate, the entrance to the Inca Trail. The Wayna Picchu hike takes you on a steep, 2100-plus-step path that includes portions of an Inca tunnel (it can be tough, but the views are worth it), while the truly dedicated can follow in the footsteps of the empire and do a multi-day hike along the Inca Trail (camping or bunking in guest houses along the way). Longer guided treks from Cusco are also available. Remember that due to the high elevation, even just walking might leave you a bit winded, so tread carefully on more strenuous treks.
Photo by Rocco Lucia/Flickr.