When traveling to Margarita Island, get U.S. dollars before you go. Don’t bother with travelers checks or Euros or whatever, just $50s and $100s in USD.

US money is very popular on the black market. You can buy 4,000 bvs for 1 USD. BUT you can only get this rate on the street with crisp 50s or 100s. The offical rate is about 2,100 per 1 USD. Without shopping around you can easily get 3,000, even with singles or 20s.