Being in Seattle we have the options to shoot in the historic city, desert, mountains, rain forest, ocean side, there are several volcanos including 1 active MT. St Helens, we have zoos and parks and aquarium, the Seattle water front, North West Trek, cemeteries from the 1800, ghost towns. And they are all with in a few hour drive away.
So if you are looking to take pictures of people or buildings I would say walk around out your front door or the water frount.
If you are looking for nature I would go to Mt Rainer or Mt St Helens or even Adams.
Animals one of the zoos, aquarium or North West Trek or again Rainer or St Helens