My husband and I were staying at Chaa Creek and decided to take the free tour offered to the Natural History Museum and the Butterfly Farm. According to the Chaa Creek website, the tour is $5/person for people who aren't staying at Chaa Creek. The guide was very informative and answered all questions that we had. The butterfly farm and the museum are located next to each other. The museum is split in half. Half covers Mayan history and the other half covers natural history. There was a lot of information about the native animals and conservation projects. The Mayan section had a display of a traditional Mayan home and info about the Mayan ruins in the area.
The butterfly farm had screened in building that contained the adult butterflies. There were only a few at the time we visited. There were also enclosures that had the pupae and larvae. The morpho butterflies are beautiful. I wished that we could have seen some in the wild!
Overall a nice visit with a good guide. We definitely recommend visiting if you are staying at Chaa Creek. However, I wouldn't drive all the way from San Ignacio just to see the museum and butterfly farm.