Calif coast between SF and Monterey native here. Highway 1 from SF to Santa Cruz has plenty of passing opportunities. It will likely be cold. We call it June gloom. The marine layer gets into your bones. Not always foggy though. 20 miles inland is 30+ degrees F warmer. No rain until end of October when it’s hot on the coast too and super Smokey from all the fires. That stretch is fun and beautiful. Carmel to nacamiento- furgeson road is the best scenery ever. I’d probably continue to Cambria/46 and cut inland to paso Robles, avoiding the US Army base that road passes through. There is a really great military aircraft museum in Paso Robles at the airport called Estrella.