There is a Blue Morpho butterfly farm at Chaa Creek. There are two other species of butterflies as well. Right now the cost is only $5bzd so I strongly encourage you to go.
Backpacker’s Tip: There is no public transportation to get here however there is a workers bus that goes back and forth. At Chaa Creek I have taken the bus back to San Ignacio to free. You can probably take it to there as well.