Where can I get a combination language immersion / hiking experience in South America?

I had four years of instruction on Spanish in high school that has come to naught due to lack of practice. I’m gifted with languages, and I figure with a month of practice in Spanish I could get pretty good. I’ve been considering the National Outdoor Leadership School (NOLS) for a good summer outdoor experience, but I thought I’d go a step further and look for hiking with the opportunity for some language learning. This may be a rare thing, so if any of you have anything even tangentially related, please feel free to suggest it.