First off, what part of the PacNW do you live in? Lemme know...I've got some good recommendations.
My favorite weekend away? The San Juans!
But at this time of year a great destination is Seattle--they have super-saver rates in all the hotels right now. You can stay in a super-nice hotel for a lot less money. Check the travel section of the Sunday paper.
Another great destination is the Oregon coast, even in winter. Hotels there are also cheaper in winter.
Port Townsend is indeed a great recommendation. It's a great jumping-off point for exploration of the Olympic Penninsula too.