Skiing, Fine dining, Night life, Hiking trails, Gorgeous scenery/ nature, etc.
and within short distance of driving to
Nevada (side of the lake) : Casino (Gambling, shows and other vices. take your pick)
San Francisco : Need I say more?
It fits the bill for 8-9 days excursion into cold weather territory without getting bored out of your mind if you are not a hardcore skier/ snow boarder.
Have fun wherever you end up going ...