They do have a few cocktails and bourbon selections for those who can’t have their beer. The Mayan Cafe truck has a handful of GF options. They don’t have a full bar that I know of, but it is a place where I can go with friends and not have to cross my fingers that they have cider on tap.
There is a taco truck onsite that is run by the Mayan Cafe. I’ve been to the Mayan Cafe many times and had positive experiences for gf food.