Your daily mileage looks fine to me. Personally, you couldn't pay me to spend time in Las Vegas but as has already been stated, it is a personal choice. I would also suggest highway 550 in Colorado from Ouray to Durango and highway 12 in Utah from Torrey to Panguitch. For my money these are two of the best roads in the US along with California 1 that you have already included.
Just one other suggestion. Do not pass a gas station in the western US unless you are certain about the distance to the next gas station. On a recent trip I saw signs that said the next gas was 60 miles away, but when I arrived the station had gone out of business. In my case it wasn't a problem because I am super conservative when it comes to gas mileage. Just be aware that in my travels around the western us the most frequent problem I have seen is folks running out of gas.