Reverse your plan. Cross over ro the coast south of Eugene to Reedsport. South of Reedsport is Salmon Harbor at Winchester bay. Beautiful sites and views.
The middle and south coasts are far less crowded, far more enjoyable. Pick your state parks heading south. Crescent city we stayed at the KOA. Nothing special. You can come NE toward Grants Pass. Be sure to visis Oregon Caves. Valley of the Rogue state park, two nights at least. Lots to see in the area. Historic Jacksonville, Oregon Vortex. From there its a short drive up to Crater Lake. Diamond lake resort offers full hookups and is a short drive to the rim loop. Come out of crater lake heading east. Spend a night at Collier memorial state park. Great logging museum here. North on 97 toward home.
At least thats how I would do it.
