A couple of suggestions if you will be driving around:
Hurricane Ridge outside of Port Angeles, Washington
The Rain Forrest at Quinault (Olympic National Park) Washington
The Pacific Coast north along hwy. 101 west of Quinault
Cannon Beach, Oregon and the Oregon coast south on hwy. 101

If you are using a GPS and searching locations on the internet many will have the co-ordinates that can be programed into the GPS as Points of Interest (POI). This is helpful since it will let you know when you are approaching a sight especially if you have a local driving behind you in a rush to get somewhere.