French braid. It's casual, comfortable, sexy and sleek all at the same time. I wear my hair like that every day for work, and only do something different if I'm "going out". It's a pain, because it's long and heavy, but I don't suit short hair
well, my favorite hair do is just to blowdry it and let it hang, but that's not much of a "do". when my hair is being annoying and i don't have to look nice (read: about 95% of the time) i put it in a half braid and ignore it.
My favorite? A french twist - but my hair is too long, thick, and curly to achieve the look except on special occasions and only with my hairdresser at the helm!
Normally, my hair is parted on the side, curls allowed to go wherever they want to. When I really don't want to fuss with it, a ponytail.