A build-your-own Mexican food bar would work, too. Taco meat & shells )hard & soft) with lettuce, tomatoes, onions, refried or black beans, cheese, jalapenos, avacado slices or guacamole, salsa, etc. Or, do the same items (add some chicken if you like) with chips and let everyone build their own nachos (add some cheese dip and maybe a few different kinds of salsa.)
This can mostly be prepped early, too!
Margaritas are always good (in my margarita-lovin' opinion). Or do a tequila sunrise.
Or keep it really simple and serve Corona and shots of Tequila! (good luck with that--tequila shots are my dr jekyl/ms. hyde drink) LOL