We go to Mexico a lot. Some of our faves are shrimp, fish chunks, Al Pastor (beef and pork mix with spices and marinated), mixed seafood . You might pick up a fave Mexican restaurant menu and get some ideas. A build your own taco bar with different salsas and condiments: Queso Fresco, crema, cilantro, jalapenos and other different sliced fresh and pickle peppers, pickled radishes and onions, shredded lettuce, refried, black, and pinto beans, pickled cactus pads, sliced olives, conch, calimari, ceviche, you get the idea.
Sounds like fun!
She who dies with the most toys, wins.