Going to Santiago was not really in our plans, we just came from Mendoza and was a thing decided from one day to another, so we had no idea of what to see or to do and decided to take a tour. This is the best thing we could do as we did it on our first day and gave us an amazing historical perspective of the city and the life of the Chileans. My recommendation is to do this on your first day, and don’t forget to bring a good pair of sneakers, as you will be walking around a lot 
Christian M
Boston, Massachusetts.