I've done a version of this trip 2 years in a row from Edmonton.
The PCH is a no brainer. South of San Francisco look for the Big Basin Highway (236). It's a redwood magnificence.
Another gem is from San Jose to Patterson (136). Very technical. Make sure to stop at the Mt Hamilton observatory.
My favourite road in the Yellowstone area is the Sonora Pass (108). Not as much traffic as the south main highway, perfect road surface, 26% grades, and a nice high climb. 2 years ago in late June started at the bottom at 23 degrees c, at the top it was -3 and snow. Beautiful.
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