Hey, I stayed in Chilecito. Did you go up through Belen?? There were 2 DEEP river crossings on the north and south side of the town. I met a Dane on a F800 GS in Cafayate and he had to detour a couple hundred miles out of the way b/c he didn't want to risk the crossings.
Where is Arena del Rio?? From Cafayate I went to Belen, Chilecito, then Mendoza.
And you know my vote is to go to Bolivia.