Nick,

Winter pelagic trips are pretty iffy as the Pacific Ocean isn't very pacific in the winter. Quite a few seabirds and alcids can be seen from the ferries plying Puget Sound including the ones that go to Vancouver B.C. Check the routes and prices here: http://www.wsdot.wa.gov/ferries/
That link and the county checklists with rarity codes for each species should be a good starting point. You can get all of the county checklists by going to: http://www.wabirder.com/ Click on checklists and then the county you want or download the Excel spread sheet for all of counties with color-coded status.

Wilson Cady
Columbia River Gorge, WA