Luis, I like you attitude! I don't know that many people so passionate about literature, that is really cool. As long as you know that you have some savings to back you up and all that, you are OK - you can always leave if things don't work out! As for hospitality industry work, there are quite a lot of Colombians etc. working in bars but I see people from other countries too, including Americans and Italians. En negro and not well paid, but if you have a cheap place, cook at home, take the bus etc. you should be fine. Tourist guides are more often Argentine in my experience, but there are different opportunities for foreigners as well.
Teaching languages I generally think pays not very well (60-100 pesos for a private class is what I hear) but it is an option, and it pays better if you get into teaching at a school I think, but harder to do en negro.
Teaching languages I generally think pays not very well (60-100 pesos for a private class is what I hear) but it is an option, and it pays better if you get into teaching at a school I think, but harder to do en negro.