What everyone is alluding to but not saying is that the bar at the Rosewood Sand Hill is famous for cougar pick-up 'events,' especially on Thursday night (honest, I've never been there so can't verify it first hand!).

It would be the closest drive to Manresa of the luxury hotels listed above since it is adjacent to I280.

Not luxury but possibly also in the running if it's only one night is the Fairmont San Jose.