Well Julien, the answer to that would be world peace...no wait a minute. Just kidding:-)
One - Cost of living is reasonable. Rent equates to 1/5th of what I usually pay. Food is extremely cheap if I cook at home (Fresh seafood and vegetables cannot be beat).
Two - Touring the Rainforest, interior, city, and neighbouring countries would be a lot easier and cheaper while living here.
Three - Warmth of the people and the place.
Four - Oasis cafe. A fantastic place to recharge when one is culturally overwhelmed.
Five - Cheap entertainment and leaning in the form of making new friends, banks beer, swimming holes, movies only available on my laptop, and the many, many national holidays.