It is a good way to know Santiago, and especially for parts as Las Condes Sanhattan, recommended. It is quite difficult to take photos as the English explanations came after the monument passed.. The Voucher can be changed in Santiago for any day, not only the one specified when booking the voucher.
Puerto Iguazu, Argentina
The tour is worth especially to avoid the formalities at the frontier. The guide took care of everything. However when booking consider that pick-up in Iguazu is at 13:30 (although tur starts at 15:00). If you just came from the airport this may be a problem as flights are usually delayed