The local currency in Jamaica is the Jamaican Dollar sometimes noted as JMD or J$.
Although prices are typically quoted in JMD, most retailers, tour operators and vendors will accept US dollars. To avoid confusion make sure you know what dollar unit is being quoted before any transaction is done.
Some places will also consider taking Canadian Dollars, British Pounds or Euro but that is very rare and you might lose out on the exchange rate.
You can also check daily exchange rates on credible a website such a Socia Jamaica
For Information on International Money Transfers and Payments Read "Information on Sending and Receiving Money While in Jamaica"