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Eugene is a college town (Universityof Oregon) and it's pretty boring driving through it - I can imagine it would be tedious to cycle around it. Closer to the coast is the Siuslaw National Forest but the Williamette/Umpqua/Deschutes national forests to the east will be more interesting.
Do note that there is a LOT of logging up there so the forest roads will have some pretty big trucks out there. Also. Hilly. And you will have limited route choice. But in fairness, the roads in the National Forests are always of good quality.
hmm, if it's not possible to swim in the sea then maybe I should skip the coast and stay inland then. I'm also not 100% sure Eugene looks that interesting. Bend has some MTB trails I'd like to have a day on so I do want to go down there.
Is there anything interesting around Eugene / Salem or would it be better to remain to the east of that and head back up to portland through the National Forests?