How do we attract investors for a planned organic spa in a tourist area in Argentina?
You can read a lot of information on finding investors in the United States, but you know full well that Argentina is a totally different market, so you have to look there.
What about http://www.inversiones.gov.ar/, which looks like a government site about attracting investors? I found it by searching for "agencia desarrollo argentino" in Google. Look at the links there.
Look locally; you'll have way too many hurdles to jump if you try to sell not just your idea, your business plan and your team but also the idea of Argentina as well.