Thanks everyone, trying to break it down by each stop. One question, we plan to leave Mid June, is this too early for Crater Lake, would we be better to actually head up the coast and return back down inland? Or does it not really matter?
So, I really like the idea of the Lassen NP as our first stop- see Bumpass Hell, and then up to the Lava Beds. and then to Bend.
Part of me wonders if we should just concentrate on Northern CA and Oregon and not WA too, although Portland which we'd like to stop near, is only 3hrs from Seattle which then makes me want to visit Olympic NP.
Or just save WA for a diff trip! We will have 4 weeks maximum.