Can't really recommend any because I am not terribly sure. I assume you speak, read and write Spanish because any written exam would be in Spanish language (in Spanish speaking countries of course). Here is a link to one in Argentina:
http://www.hangarnorte.com.ar/index.asp
There are also flying schools in Panama City (Albrooke Flight School)-- they have some friendly English speaking instructors, costs are reasonable, but I believe your written exam would be in Spanish. (Tel: (507) 232 7349 or (507)232 8788 or Fax

507) 232 8675).
If you want to do helicopters in Panama, there is Helipan:
www.helipan.com/english
In Costa Rica there are a number of small schools at the Pavas airport in San Jose-- this is the general aviation airfield and not the one where the major airlines fly into. Sorry, I have no links to that one.
Then there are also a couple of schools (or there were the last time I checked) in Guatemala. I found renting an airplane there to be expensive compared to, say, Panama. Also Guatemala is a considerably less safe city than San Jose, Costa Rica or Panama City.
There may be a few schools in Honduras, Belize or El Salvador but I don't know of any. In Nicaragua there are a couple of guys with airplanes who do training, but nothing very organized and I don't recommend it (also Avgas is very expensive in Nicaragua).
All of the countries in Central America are ICAO states, but some of them have their compliance out of order. You're better sticking to countries like El Salvador, Costa Rica and Panama. Back in the world of the JAA, a license from Central America will probably be treated like a license from any other non-JAA country-- in other words you need to convert. I believe there may be exceptions to this in the UK and Holland (so I have been told). Keep in mind that if you return to an English speaking country you may need to get the details of your license translated by a recognized translator to be accepted by your local CAA for conversion-- this would not be an issue for a FAA or Canadian license and is probably a minor detail in the grand scheme of things. Check out this link for a better overview of the situation:
http://www.helipan.com/english/train...l#Anchor-49575
Flying schools in Latin America are generally not as well organized as those in Canada or the US, and many latin pilots train in the US. Nevertheless, if you want, they are definately there.