After you pass Big Sur, when you get near Hearst Castle, their is a KICKASS beach with a bunch of seals just chillin. I'm talking thousands. If they're still their, you can't miss it. I swear, this one seal was totally looking at us like "What's up dawg?" as he flashed gang signs with his fins. It was awesome. Definitely recommended.
Hearst Castle is really fuckin cool if you wanna do something touristy. If you want to make it to Cali in a day, then i5 it all the way, don't do the Oregon Coast thing as it's bloody slow (unless you wanna enjoy the nice breathtaking scenery with your bro-friend.
Big Sur is awesome for camping and checking out, but again if you're planning on b-lining it to San Diego or LA for that matter then stay away from the coastlines.