The unabridged version is 14h 34m long. By the end, it felt like I had listened to about four hours of good story with 10+ hours of unnecessary filler content.

The writing is good. Clear, readable narrative does not get in the way of the story. If only there were more story to share.

The characters are a study in shallow, overplayed tropes: young Americans on vacation making stupid decisions; goofy "foreigners" (Greek, in this case) who are unintelligible to the main characters; inscrutable "locals" (Mayans, in this case) who endanger the main characters without explanation or any development beyond being hostile; male characters who are trying very hard to organize things and save everyone; female characters who are inexplicably selfish, silly, and remarkably horny.

The "horror" in the book seems mostly to be detailed descriptions of bodily functions - both human and animal - that don't add much to the story or sense of foreboding from a slowly encroaching threat that I think the author was trying to build. The conclusion of the book is foregone within the first 30% or so and the rest felt like a long and painful wait to get there.

This felt very much like an excellent novella that was stretched with a great deal of unnecessary filler.