Brazil is a VERY big country, the world's 5th largest, I believe, after Russia, Canada, China, and USA. It will be difficult to help you without more details about your trip.
The general stuff is that the language is Brazilian Portuguese, Portuguese in Portugal is slightly different. The currency is the real and its value against the dollar has been rising rapidly for the past 3 or 4 years. The exchange rate right now is around 1.75 reais per dollar. Of course you know that Brazil is hosting the 2012 World Cup and the 2016 Olympic Games. Brazil took in more slaves from Africa than any other country in the world and was the world's last country to officially abolish slavery in 1888. Brazil has more residents of African descent than any other country except Nigeria. It also has more residents of Japanese descent than any other country except Japan. Brazil has one of the world's highest degrees of inequality in the distributions of income and wealth.
Your observation that ALL of the men who went to Brazil STAYED there should tell you something. Most Brazilian women are good looking and have sexy bodies. In addition, there is an acceptance of sex as a natural human need. Lots of European men move to or retire to Brazil by marrying a Brasiliera.