Oh yeah it's worth it. Duck hunting in December isn't just any duck hunting. You hunt sea ducks, they are awesome. Great plumage, unlike anything else you'll see on the mainland. Don't taste half bad too... some are a little oily. A lot of harlequins... some longtails (oldsquaw) maybe an eider or two... which are huge ducks.
The fishing is mostly rockfish and halibut, but still good, and also some searun kings. Some of them you might have to run out a bit for. You might be able to get in for some steelhead too, that is awesome fishing.