Since I am Mexican I'll tell you. Mexican parties are really fun. We have pinatas. Lots of tortilla chip and salsa, loads of dancing, tamalas, and cousins.
But it depends what kind of party: Quincenta, birthday, anniversary, wedding, cinco de mayo, day of the dead, or just a get together. It all really depends. But you gotta make sure you have the Mexican music. If not, it is just a party, not a Mexican party!