I used to live in SF Bay area, best bet for your money is to look online and rent a csbin/house from someone. Usually cheaper then the hotels, you do some grilling/BBQing if you have a lot people, and have a great time. My wife and I did this one year for our anniversery and got a big cabin that could sleep like 12 for just the two us, cheaper then any hotel room for a week.
I have never really stayed at any of the hotels in Tahoe, but they all seem ok from what I have seen of them when visiting. I also recommend the dinner cruise. Although we went in August so it was nice and not too cool and the food was good.
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Jorge300