On the CA leg tho...the coast is beautiful and the mouintains are beautiful, but other than zig-zagging up the state, don't see how you can do both...if you ride the coast from SD to SF, in order to drop in on KingsCanyon/Seqouia Natl Park, you gotta go almost all the way back to LA, and then to catch Yosemite on the way up, well, it's a long ways inland. There are some awesome roads up thru the Sierras, but again, I'm thinkin it's one or the other.....although if there were other northern guys like me who are thinkin of going south, then coming back up, a huge loop was sorta what I had in mind, but heh..do I go down the coast and come back up thru the mountains? or down thru the mountains, say thru Susanville, down 395 thru Reno and up to Tahoe,down the top of the Sierras thru Yosemite and Sequoia and then back up the coast? Geez..what choices...
And us50..the loneliest road in America? Used to ride it between Sac and Tahoe all the time and got stuck in traffic more than a few times, especially if you try to go to Tahoe on a weekend. It was gnarly 25 yrs ago, don't imagine it's gotten any better, something I'd try to avoid...