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Ditto that.
Take lots of $5s and $10s. The US dollar is welcomed and often preferred all over Belize, but the change back is usually given in Belize currency. So if you can pay with $5s and $10s you can better manage the amount of BZ currency you're going to try to dump before you leave.
The exchange rate is $2BZ to $1US, which can sometimes lead to sticker shock so be sure to ask if you're unsure.
Estele's will do the same thing.