I just got back from a Mexico trip and was able to escape for a morning to a guided tour near the Muyil ruins. It was my first ever guided tour and nobody else signed up, so I was 1-on-1 with the guide, which was great (minus the additional cost).
We saw 80 species in about 5 hours, which is tough to do when you're birding in the the forest/forest edges the entire time and not around a large body of water. Unfortunately, I'm not a photographer, but we saw some incredible stuff including 2 species of motmot, 2 trogon species, aracari (mini-toucan), 3 parrot species, 4 oriole species, 3 hummingbird species and a crazy looking bird called a royal flycatcher.
The guide, Miguel, was incredible. He finds things by ear that I would never even notice and spent 10 years in the states, so speaks great English. I'd recommend Amar Aves birding to anyone visiting the Yucatan with an interest in birds or other wildlife.
Also, here's a ferruginous pygmy-owl from the resort.