John makes a good point. If I were going to the redwoods plus beach from Chi-town and back I'd take the interstate on the most direct route calculated by my iphone Apple maps.
Seriously, there is no way to see enough of CA in two months, much less two weeks. There are a couple of redwoods parks closer to Big Sur and you could get some scenic beach time in too.
My advice, pick one or two general areas and give yourself time to travel easy, to and from, and plan to see those areas and see a couple things along the way and the time to just sit back and enjoy it- to spend days of un-structured time in those places and a half day in a couple others.
There's gonna be a day or two because of weather, a flat tire, traffic etc you'll want to have that extra, or just take a meritorious day off from driving too. If you are in the northern route thru high plains there are two seasons: winter and "construction ahead"
Yosemite/Kings Canyon/Sequoias, or Yellowstone/Tetons for that matter are places that make me think God packed in so much beauty in one place that you could not deny the existence of a higher power.
Get your reservations for the really popular places a year ahead.
Then you have time, barely, in two weeks.
I most highly recommend three.