Ancient Mountain Spirit inquired about folklore of the ancient Maya, and cited the works by Victor Montejo and Fernando Peñalosa.
While these works are good, and well worth reading, I suggest going to the original sources as much as possible. This includes the Popol Vuh, which is a must reading for anyone interested in the perspectives of the creation by the ancient Maya. Allan Christiansen, who is a fluent Quiche speaker, has made an excellent translation, as has Dennis Tedlock, who used Quiche shamans in his translation. Both versions have unusual strengths and insights.
You might find the book Ritual Humor of the Highland Maya by Victoria Bricker also interesting and worth a read, as it deals with folklore issues.
The books of the Chilam Balam are also an interesting take on this (e.g. Chilam Balam of Chumayil).

And, don't overlook the original spanish documents which have fascinating hints about the ancient Maya as they existed when the spanish got there. The best is Diego de Landa's Historia de las Cosas de Yucatan, especially the version translated by Alfred Tozzer because of the extensive notes that are added below the text.

Bernal Diaz de Castillo's The Discovery and Conquest of Mexico is also an amazing window into ancient mesoamerica and the Aztec conquest, but gives tremendous insight into Mesoamerican cultures as they existed when the Spanish arrived. If you haven't read these, you are missing a fascinating saga of world history.