Take time to acclimate once you reach high altitude in the Andes.
If time permits, spend a second day at Machu Picchu. If you are able, add one of the hiking options (Machu Picchu Mountain or Huayna Picchu) to see Machu Picchu from above! Machu Picchu tends to be one of the highlights of any trip to Peru, so make sure you take full advantage while you are there.
Don’t skip over Lima! Take time to explore the capital, catch a sunset on the Malecon, and indulge in some of the best food South America has to offer.