Go to Mammoth. By far the best mountain in Socal (or near socal). It's a legit big mountain - 11,000 feet at the peak.
Last year was a bad year not only for Mammoth but in the midwest in general, but I still managed to get there on a March weekend when it dumped 3 feet in 24 hrs. That morning was EPIC - see pic. Mammoth gets ALOT Of snow - at one point in 2010, it had the most snow of ANYWHERE IN THE WORLD.
From what i've read, Mammoth should have a good year this year.
Mind you, it's a solid 5 hr drive from Los Angeles. But IMHO, it's worth it. I love that mountain.