I have not yet made the trip to Arizona, so I cannot help with the overall trip planning. However, I do love traveling south on the 101 down the Oregon Coast. All the scenic turnouts are then right-hand turns, so it is much safer.
If you are heading west on US 30, don't forget to stop at Bradley State Scenic Viewpoint, in Clatskanie, Oregon
. A very nice area for a break on the way to the coast. Hopefully, it will be open when you are going by that way.