The U.S. dollar is the official currency on several islands: the United States Virgin Islands, Puerto Rico, the British Virgin Islands, and the Turks and Caicos. Many of the smaller eastern Caribbean islands--Dominica, Antigua, and Barbuda, St. Lucia, St. Kitts, and Nevis, and others --use a common currency known as the EC or Eastern Caribbean dollar. Others have their own currency: the Jamaican dollar, the Dominican peso, or the Aruban florin. Even on islands with their own currency, the U.S. dollar is widely accepted at most tourist areas.
Meeting participants should be advised to exchange only the amount needed. In the Dominican Republic, for example, travelers can only exchange 30% of pesos back into dollars, even with receipt of exchange.