给你个路线图吧

City of Roses, Portland (Washington Park/Rose Garden/Saturday Market) >>Columbia Gorge>Mt St Helen >Mt Rainier：早上Sunrise下午Paradise >>Tacoma Glass Museum (external exhibit-no need to go inside /Dale Chihuly Bridge of Glass)>> Seattle City >>Everrett Boeing Future of Flight tour >>N Cascade NP (turn around at Diablo overlook if limited in time)>>从 Hwy 9 接 542E走到Picture Lake和Artist Point （去AP的路一般７月下旬到９月中旬开放，PL永远开，光PL也值得去）》》５４２转Sumas进加拿大去温哥华》》温哥华城里》》Sea to Sky Hwy至少走到Squamish有时间可继续去Whistler（不滑雪也一样美）》》从Horseshoe Bay渡船到Nanaimo, Vancouver岛（Victoria 所在）>>Victoria 渡船到Port Angeles(Olympic NP的门户）》》Hurricane Ridge/Lake Crecent/Hoe Rainforest/Ruby Beach/Beach 1,2,3,4>>Astoria>>Seaside>>Cannon Beach (紧靠CB北面有个州立公园很漂亮，人也少，忘名字了）》》Tilamook（附近有个好像是叫3 Cape loop的路值得开）》》Lincoln City>>Newport>>Florence （沙丘）>>Coos Bay>>Gold Beach

Oregon沿海有好几个灯塔，很漂亮。南Oregon (Coos Bay>>Gold Beach)到北加海边都很漂亮，很久前走过一遍，有点忘了
这么走还是有顾不到的(e.g.San Juan Islands)，但是基本上不走回头路了