I just saw a mention that the coast was "the best part of Oregon." Of course, that's one person's opinion...an opinion shared by many others on this forum...even me, sometimes. It depends on my mood and where I happen to be at the time.
I love the coast and lead hikes there several times a year. When I'm there, I'm in heaven. However, I feel like that also in the heavenly company of a beautiful Cascade waterfall, wilderness lake, old growth forest or atop a mountain on a clear day when I can see all the peaks from Hood to Diamond.
And then there are the urban cultural and culinary pleasures of Portland and Eugene; and the special treats of Ashland. After all, one can't live on just Mother Nature's natural beauty alone (or can we?).
In my opinion, there is no "best of Oregon." It's all great and we do visitors an injustice by urging them to go to any particular region before we determine their mood, their preferences, their personalities.
It's Oregon that is "the best." We have a magnificent state, in all its parts.