Machu Picchu, Peru
To trek or not to trek? These two posts cover in depth the various options you have to get to the famous ruins. No matter what you decide you will end up in the nearby town of Aguascalientes.
If you’re trekking you’ll have accommodation taken care of in Aguas Calientes. If not here are some suggestions.
You’ll just need to stay the night before you go to Machu Picchu, there is no real reason to stay any longer. You can easily head back to Cusco in the same afternoon. It is possible but very inadvisable to do it in a day trip from Cusco. You won’t have the time or the energy to be able to enjoy or take in anything.