http://www.dgcoursereview.com/course.php?id=35 DeLaveaga is a must play if you're coming to California.
Some of the other good courses in the area are Ryan Ranch (Monterey)
http://www.dgcoursereview.com/course.php?id=2803
...
And Black Mouse (also in the Santa Cruz area)
http://www.dgcoursereview.com/course.php?id=1016
Black Mouse is located on school grounds, so make sure its the weekend or after school hours if you intend to play it.
Have a fun trip
I was down to Monterey over this past weekend. I played most of Ryan Ranch--it was the closest to our hotel--Saturday (holes 1-12) and Sunday (holes 13-18). What I played was definitely worthwhile. Otoh, looking at 19-27, which I didn't have time for, on the map and from a distance on the ground, I don't feel cheated to have missed them.
On the way back to Redding, my wife and I played Black Mouse. It is not very polished, and was quite a work out going up and down, but was challenging, scenic, and shady. I have not played DeLaveaga, though I have watched quite a bit of tournament footage; given my skill level and noodle arm, I am quite happy to have chosen Black Mouse over DeLaveaga.
If you come down the coast, the Eureka/Arcata area has several course. I have only played
Humboldt State University there. Like Black Mouse, it is in the shade of Redwood trees. I would consider it a must play if you are driving by.
If you are traveling on I-5,
University of OB in Weed, CA, would be a good stop.
The only course in the Redding area that I think might be worth stopping for would be
Sacramento River RV Park, but I'm not sure that I would call it a must play, just that it is definitely better than any of the others.
Wherever you stop in Northern California watch out for Poison Oak. However, I have never seen PO at Univ of OB, don't remember any at Humboldt State University, and only saw a little at Black Mouse.
Have a good trip!