When you reach the city, download at Google Play this mobile app and it was very useful. Reports of monuments, parks, museums,restaurantes,bars, nigth and sights of the city.
https://play.google.com/store/apps/details?id=app.iviaxsm.toursantiagopro
https://play.google.com/store/apps/details?id=app.iviaxsm.toursantiagopro