i don't want to bring anything like tacos, burritos, enchiladas, etc. i want something that people from america aren't as familiar with. thanks 
You could bring many real Mexican dishes…
Pork:
Costillitas de cerdo con calabazas, elotes y poblano
(Pork ribs with zucchini, corn and poblano)
For 3-4 regular servings
In thick pan brown pork ribs (1 lb), when done, add 1 cubed onion and when translucent, add 1 cup white corn, 3 thick cubed zucchinis and 1 cup frozen poblano strips; let it fry for a couple of minutes, and add 2 cups cubed tomatoes or 1 cup tomato paste. Add salt and pepper to taste. Cook until meat is tender and corn is fully cooked. As they are ribs, it is almost finger food; you could serve with warm tortillas to help with the vegetables.
Beef
Bisteces en pasilla (beef strips in pasilla sauce)
For 3-4 regular servings
Brown in thick pan 1 lb beef strips, add 1 small cubed onion, when translucent, add 1 small bag cooked nopales and 2 small diced raw potatoes, when lightly browned, depending on how thick you want it, add 1 or 2 cans pasilla sauce (Doña Chonita is a very good one), and let everything simmer for about 20 minutes or until potatoes are fully cooked. Serve also with warm tortillas, or if you can cut the meat o bite size, you can serve it with tortilla chips (real ones, not Tostitos)
Chicken
Pollo en pipian (chicken in pumpkin seed salsa)
For 3-4 regular servings
Cook and shred two chicken breasts as you normally do. In blender put 2 cups peeled and unsalted pumpkin seeds (if you cannot find unsalted ones, rinse them in a colander), 1 big jar of "La costeña" green salsa, salt, pepper. If you want it hotter, add 1/2 or whole fresh jalapeño chile to the blender. In pan fry this sauce (cover it or you will have to do a lot of cleaning) until it changes to a "cooked color", if you feel any acid taste in it, add a pinch of sugar and let it simmer for 5 minutes. If it is too thick, add some chicken broth 1-2 spoons at a time. When done, add the shredded chicken and serve it with tortilla chips or warm tortillas.
Fish
Ceviche (Ceviche)
Fro 3-4 regular servings
1 lb fresh red snapper fillets
3/4 cup freshly squeezed lime juice
1 large tomato, cored, seeded, diced
1 small red onion, finely diced
2 bunches cilantro leaves, roughly chopped, about 1 cup
1/2 cup bottled clam juice
2 Serrano chiles, stemmed, thinly sliced into circles
1 1/2 teaspoons salt
Cube 1 lb red snapper fillets in glass bowl, add 1/2 cup lime juice to cover it, marinate in refrigerator for 15 minutes, and then drain it discarding the juices. Put marinate fish in other bowl and add 1/2 cup lime juice, 1 seeded large tomato diced, 1 small red or white onion, finely diced, 1 cup chopped cilantro leaves, the clam juice, 1 serrano chiles finely chopped with seeds removed, and salt to taste. Chill for an hour and serve with tortilla chips or saltines.
Dessert
Flan (Flan)
Serves 1 – 9 inch round mold
1 cup white sugar
6 eggs
1 (14 ounce) can sweetened condensed milk
1 (12 ounce) can evaporated milk
1 tablespoon vanilla extract
Preheat oven to 175 degrees C. In a medium saucepan over low heat, melt sugar until liquefied and golden in color (Do not overheat it or let it turn dark brown or it will not taste good) Carefully pour hot syrup into a 9 inch round glass baking dish, turning the dish to evenly coat the bottom and sides, and let it cool. In blender put eggs, condensed milk, evaporated milk and vanilla until smooth. Pour egg mixture into baking dish, and tightly cover with aluminum foil. Place the mold in a larger baking dish with water reaching half flan mold. Bake in preheated oven 45 minutes. Let cool completely, and to serve, carefully invert on serving plate after running a knife around the edges when completely cool.
Hope this helps…