Well, I'm Argentinian and I live in one of the most visited trekking places in Patagonia; so here goes a VERY personal opinion.
Do you know how many DSLR toting "gringos" we receive each year? Hundreds, perhaps thousands. And I have yet to see one of them doing something remotely different from the guy who just left- all the market candids, all the "cute locals" doing cute local stuff has been already shot hundreds of times, both on MF, 35mm and digital.
If a change to this routine is not an option, I'd at least try to do it with a different format. I'd really prefer 50 4x5 keepers and a bunch of casual digi PS shots to hundreds of MF slides or thousands of RAWs that replicate what has been done before in the same places. But that's just a personal opinion.
At least in Argentina you can easily buy 4x5 film in Buenos Aires, both color and BW. And heck.... few people can say- I traveled through the whole South America shooting 4x5.