>>1505405>>1505417>>1509469All quality suggestions. I would maybe add sugarloaf/gunsight rock in Sonoma county.
If you're feeling a little more ambitious, Redwood National Park is about 5 hours north and absolutely worth the drive. Yes, there are redwoods in the bay area, but the old growth forest up north is like nothing else in the world. Makes the sad, dry redwoods in the bay area look like matchsticks.