Snowboarding in Tahoe during the winter is hard to beat. Just a short drive from the Bay Area, Lake Tahoe offers a wide variety of ski resorts with runs for all skill levels. You can usually get a great deal on a season pass and if you end up going for 5 or 6 times during the winter, you more than get your money's worth!
If you visit any of the Tahoe websites, you're able to buy a season pass directly from them. Usually as the winter months get closer, the pass is a little more expensive. The only multi-resort pass I'm aware of in Tahoe is the "Double Whammy" pass that is good for both Northstar and Sierra. Hope that helps!