Make sure you know your access number before you go on your trip. Be a responsible guest and, if a devaluation should occur, be sympathetic and don't gloat over your new fortunes. The concepts of time and punctuality takes on different meanings in Latin America. Personal dates are often delayed a half hour or more without any ill intention, but business appointments and movie showings are generally on time. Most travelers to Latin America arrive by airplane.
Many newspapers give a best price list.
Get a ballpark figure from web sites, then go to a favorite travel agent. Once you're in Latin America, you'll notice that buses are the most popular form of public transportation, and they're quite good. First class buses provide comfort to long-legged travelers. Second class buses are cheaper and traverse rural areas. If you're short on time, you can always rent a taxi by the day.