You can always get out early and hit I-5 just prior to Tracy then zip up to Williams and jet over to Clear Lake SRA for the night. Going through Stockton and Sacramento sucks but the speed limit is better and you would really make some time. After Sac, it's mainly farm land. Cut over on highway 20. Fuel in Williams @ Hwy-20. Make sure you go to
Granzellas for lunch/dinner. That place has the best pizza and deli around. Highway 20 to Clear Lake is a bit windy (as in curvy) but a nice drive. Lots of vineyards and pear orchards around the lake. The park is nice but can be crowded during the peak season. They used to let us stealth camp at the boat launch but my guess that has changed. I can get to Clear Lake from Turlock in 4.5 hours just to give you an idea. You'd still have a good drive from Clear Lake to Crescent City via 101 but it's a bit closer than Napa. Just another suggestion.
The main thing is not to underestimate the size of California.