2 days hike to Machu Picchu is a superb option instead of the regular tour. You would most likely be doing the classic Inca Trail starting from Km 104, experiencing the excitement of reaching the citadel on foot through the Sun Gate. The 2 days hike to Machu Picchu is not solely achieving the end goal, but experiencing the route the pilgrims and messengers would have taken hundreds of years ago.