Well done, great summary, surfinsnow
. Pretty much sums up everything.
The only thing I would add to the OP is that the Shell gas voucher doesn't include Northstar anymore, but it includes Squaw/Alpine, which still makes it a great deal since you can get two mountains in one and lift tickets there are pricey. The Shell deal calls it "Ski Free", but it is a buy-one-get-one-free deal. Also good at Sierra and Homewood.
Have fun in Tahoe! Snow's been good so far, and you have lots of choices!