As a native Californian I definitely use "up" and "down". Up to L.A., down to San Diego. I might make a trip up the coast to Oregon or Washington. I also might go back east (meaning the east coast). Never used "out" though, probably because I'm already about as west as you can go on this continent!
"Over", however is just used without regard to direction, though it generally signifies a close distance. I'd head over to the city next door, but I'd never head over to Las Vegas. I'd head "out" to Vegas though. So maybe "out" is for far distances?
"Over", however is just used without regard to direction, though it generally signifies a close distance. I'd head over to the city next door, but I'd never head over to Las Vegas. I'd head "out" to Vegas though. So maybe "out" is for far distances?