Hello...I am taking a group tour in Argentina and Chile. This is not my normal (solo) mode of travel, but sounds like a decent value and will be relaxing for me to let someone else be I charge.
I have have more time available (26 days), than the length of the tour (18 days). So, I have arranged to arrive 4 days earlier and leave 4 days later than the rest of the tour group. In the first 4 days. I am flying to see iguazu falls. Should be cool and fine. So far so good.
For the last 4 days... December 26-29.. I am contemplating flying to Salta to explore. This would give me 2-1/2 to 3 days there.. leaving out flying time.

The tour itself will go to the parana' delta area , rocoleta cemetery area, explore one or two neighborhoods in Buenosaires and gives us about half a day that is unstructured and on our own. This doesnt seem like much time to see the city. before we the fly off to Patagonia.

my question is this. With 3-4 extra days... should I spend them getting to know Buenos Aires better, or try to fly to Salta... which seems to be interesting and cool. In the later option I would probably lose a day due to flying.. (the flight is only 2 hours, but to get to airport and out of airport twice etc.. will shoot most of a day.

I also considered taking a ferry to Uruguay and renting a car, but I read that Uruguay is quite sedate.... So.. Uruguay? Buenos Aires more in-depth or Salta?

BTW, this will be my first time ever in South America. and I do not speak Spanish.
but, I am a relatively experienced traveller.

appreciate ay input.