Will you need to change your money a different currency in Belize?

No. The official currency of Belize is the Belizean dollar (BZD), which is pegged to the US dollar at a fixed exchange rate of 2 BZD to 1 USD. This means that the Belizean dollar is effectively the same as the US dollar, and you can use US dollars freely throughout Belize. In fact, many businesses in Belize prefer to accept US dollars over Belizean dollars, as it simplifies their accounting. However, it's always a good idea to have a small amount of Belizean dollars on hand for small purchases, as some vendors may not have change for large US dollar bills.