sacramento to eureka california

I used to work that area and drove the three routes frequently. If you want the fastest, easiest drive, without much senery take 20. If you want scenery, the Trinity river is beautiful, and a drive with some curves and hills take 299 - it's slower than 20 but prettier. Avoid 36 at all costs, narrow with lots of sharp curves - you don't get to enjoy the scenery because you are trying to keep on the road and avoid potholes.