First of all, I owe an apology to all my readers on the West Coast. In my first post, I said I remember there being a bunch of islands off the coast near Portland. Portland is not on the coast. I was thinking of Seattle (or should have been). At least my memory of Puget Sound being on the West Coast was correct...
From cruising around Google Maps a bit now, I think I'll start the campaign here:
There's a bunch of small islands to start on (small being easier to clear off) which should, if I recall my climate science correctly, be sheltered from the worst of ocean weather by the honking huge island known as Vancouver Island to the west and relatively easy access to the Pacific fishing grounds with that strait between the western part of Washington state and Vancouver Island.
Plus, if the enclave does well and gets ambitious, they can work on clearing all the casualties off all of Vancouver Island for living or agriculture area. Also, to the southeast are the connected (ish?) islands of Fidalgo, Whidbey, and Camano, all of which are in fact islands (or will be when the roads wash out) but easily connectable to the mainland. Good staging ground raids on the mainland or beginning to clear it out.
Also, given the proximity to the part of Canada that didn't get nuked, I think I'll be able to work in some interesting things mixing up the population between Americans and Canadians. Plus the politics between American and Canadian enclaves.