1. Do plenty of market research or property evaluation in Costa Rica real estate before starting up any business in Costa Rica. The Tico consumer can be fickle, and a seemingly sure-fire bet may not be such a safe choice as you thought.
2. Be on lookout for con men, be aware of the differences between the legal systems of Costa Rica and your own country, and get a good lawyer.
Dont's
1. Pay bribes. It may or may not work out - but could easily end with your being deported.
2. Use an overly-aggressive sales pitch. This will really turn potential Tico buyers off.