Consider it mission failure if you do not spend at least two days exploring the Olympic Peninsula.
A circumnavigation is in order, turn left at Olympia and proceed to the coast. Take a legal drive on the beach near Moclips (major photo ops). Hit the 101 North, do the loop around Lake Quinalt (major photo ops), take a hike through the only temperate rain forest in the lower 48 (major photo op), head up 101 through Forks (of Twilight fame) to Sol Duc hot springs, continue around 101 to Bremerton and take the ferry over to Seattle. I'm sure I'm missing some highlights but you get the picture, you will not be disappointed with the OP!!!
Bridges in Aberdeen has good steaks. And the Lake Quinalt Lodge is a good place to stay if you enjoy rustic history ala Roosevelt.