Shrimp fajitas are a delicious and healthy option for a Mexican food dinner. Marinate shrimp in a mixture of lime juice, garlic, and spices like cumin and paprika. Sauté the shrimp with bell peppers and onions until they are cooked through and tender. Serve the shrimp and vegetables in warm tortillas and top with guacamole, sour cream, and fresh cilantro.