Mexican food was made for open air dining. Much of it is finger food, and a few runaway beans making a break for it across your lawn or deck are no big problem. It will be easier to organize a pinata bashing event outdoors, which, let's face it, is a very nice way to let off steam. There's something nice about decorating with all those yellows, reds and other bright colors against a background of blue sky, too. If you set up outside, you can also use pretty, inexpensive colored lanterns for illumination. They're romantic and can help keep the party mellow long into the night. Add a margarita or some Mexican beer, and you have the makings for a perfect casual meal with good friends.