The U.S. dollar is the official currency of Turks and Caicos, Puerto Rico and the Virgin Islands. The U.S. dollar is widely accepted in the Cayman Islands, Jamaica, Belize, Honduras and St.Maarten.
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US currency is widely accepted on the island. There are currency exchange booths at the airport, and your hotel or resort might be able to exchange money at the front desk. Additionally, Saint Lucia has several banks that will exchange your funds.
It is recommended that you bring between $150 and $500 per person for spending depending on what you plan to do. Please have at least $200 in small bills ($1.00, $5.00 and $10.00) with the balance in twenties.