On all oue Negril.com Main Menu pages, near the bottom of the right hand side of each page is a currency converter available for all national currencies.

And while Ras Walleye is correct at the moment for interbank rate is 104.50, same number shown on the currency converter (which is also the rate you get on your ATM card minus any fees), the best Cambio rate available today was about 102.30 to 1.

Most places are giving between 95 and 100 right at this moment. Unless you are talking serious money (paying for the hotel, not a just bar tab or a meal) - the total difference is cents on the dollar, less than tip money...