We had a great experience with Eduardo at EcoColors tours. His driver, Lugo, was also an excellent bird guide, so we had plenty of local expertise at our disposal. I don't know if you need transport to be arranged, but they can handle that, as well as multi-day tours, lodging, etc.
We were in Tulum, so we spent the day in Muyil and surrounding environs. Lots of birds.
They switch to doing mostly whale shark diving tours in the summer months, but should be in bird guide mode for October. Don't be put off by the whale shark slant of their website-- they are very capable bird, nature, and archeology tour guides as well.