Which weekend trip would you choose: San Francisco, Monterey, or Vegas?

I am very familiar with all three places (I live in the SF area). That is a really difficult decision because they are all fun. If you're driving and you only have 3 days, it would be rushed to see all the sites on the way to/from San Francisco and spend a decent amount of time in the city. Monterey is fun in the winter, you can rent a hotel with a fireplace in it, very romantic. Vegas is always way fun and lots to do. I guess I'd pick Monterey for a 3 day trip.