I'm totally overwhelmed trying to figure this out. We are arriving at Seatac noon on 7/29/14, attending a wedding in the evening 8/2 in Seattle, flying out early am on 8/7. Plan to rent a car. Wish list includes Olympic Ntl Park, San Juan Island and day trip to Mt St Helens. We're really more nature people than city people. What order should we do this in? How much time in each place? I hear horror stories about taking cars to San Juan Island so am willing to ditch the car for that segment if advised. Any advice would be most appreciated.