suggestions?

assuming i go to sf in early october and use 5 days of vaca, i will have 6 days left to go away, probably in november or december. i'm drawing a blank and need help. where would be a cool place to go at that time of the year.. in the continental us, canada, mexico, caribbean, central america? basically somewhere closeby and relatively easy on the wallet. i will also probably be going alone as i doubt any friends will conveniently have the same vaca and money lying around.