If viewing the eclipse is your primary objective, the Northern California Coast is probably the worst spot on the eclipse line to be, especially that time of year. It can be foggy for days or weeks without any sun. If you like the desert, you may want to consider the Pyramid Lake area in Nevada. You can fish and camp there, and there is a bouldering spot called Purgatory a little bit north of Nixon. It could get a little warm there, however.