I want to go to a Spanish speaking country to learn Spanish while doing volunteer work.But need a good program?

I want to go to a Spanish speaking country and do volunteer work, like trail maintenance, painting or farming, while learning Spanish. Does anyone know of any good programs that falls under this category? Last summer I was 17 and went to Costa Rica and just learned Spanish, so now I am 18 and would like to do more than just learn the language. I would also like to go to a different country.