Like others have said, the National Parks are a must. Through Lake Tahoe in there if you haven't been (if possible...it's a little out of the way for the route you want to take).
A little home town bias here, but I'd suggest you don't pass up Sacramento (only the central city though, the rest of the metro isn't much to look at(kind of a sad reality for a metro of 2 million people)). Very under the radar for most outside the state and even some from CA, but has been getting noticed more recently.
Hit me up when you pass through SLO.
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Riding out the crazy train
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