Big Bear resorts (Bear Mtn and Snow Summit) offer a regular ski season due to MEGA snowmaking. Good stuff. I skied Summit two weeks ago in spring conditions when it was 90-degrees down the hill. Waterman and Baldy in the San Gabriels offer more challenging skiing (some of the challenge having to do with coverage, as neither is much into making snow). If we get it, though, and you want some trees and steeps, the latter two will get it done, assuming ample coverage.
Mountain High in the San Gabriels also makes snow and offers a dependable season.
Be aware that you are now in Boarderlands.
edit: SoCalSkiStuff[ April 08, 2003, 10:17 AM: Message edited by: ryan ]