You may see the pictures I took during the travel (7/6~7/13)
Attached is the map for your reference.
The first day (7/6) we arrived Seattle airport and rent a car take 30 min. to the hotel which located at North Seattle.
2nd day (7/7) we take I-5 through Tacoma turn to 16 Hwy and connect to 101 to 20 Hwy to Port Townsend, here is near the Olympic National Park, this is nice view.
3rd day (7/8) we go to City center of Seattle and left at 7:30pm to Vancouver by I-5 and 99 hwy.
4th day (7/9) we take a city tour in Vancouver.
5th day (7/10) City tour by Skytrain and SeaBus, take 99 to Squamish, the road called as "Sea-To-Sky" because you can see sea and will go up to sky.
6th day (7/11) Vancouver to Mount Vernon Washington.
7th day (7/12) Mt. Vernon take 20 Hwy to Whidbey Island at Clinton port take ferry to Mukilteo and connect to I-5 to Seattle.
