This is a long day starting at 6.30 am and returning at 8pm covering about 550km. Travel out of Salta through the long gorge all the way to Humahuacca,stopping at various small towns of interest including the highest city in Argentina,San Francisco.
The main objective is to take in the amazing scenary whilst travelling through the gorge,it is a UNESCO world nature site due to the natural geological striations that appear in the hills,silicon,ferrous sulphate and lime are just three of the many types of rock,when the sun goes down these appear like a rainbow of colours.
Most of the tourist buses stop at the same lunch spot and there really is no other choice and it is pretty awful to be honest with the obligatory local musicians walking around after every song with a hat for tips and then trying to flog the CD etc,, There are some stops that are a little tedious,ie a small stone church with a few paintings in it.San Francisco,the last stop is actually a great place but you are limited to thirty minutes. A visit to an old Inca settlement is ok if you are into reconstructed village huts and llama pens.
If you go on the tours,the route is standard,you could do the trip in stages by staying overnight half way but unless you are really into geological formations then it is not really worth it.I did meet several backpackers who had taken the slow route and regretted that they had,but as a day trip it is certainly worth doing.
This review is the subjective opinion of a TravelPod member and not of TravelPod.com.