Not sure what you're asking? Interesting places to drive to and then fly? Interesting places to drive to and not fly? Interesting places to fly to?
In any case there are loads of interesting places within 3 hrs of SF, I suggest you buy a guide book. You've done the easy ones, there are lots of interesting ones heading north for example. But if you're looking for interesting places where you can rent a heli within 3 hrs drive, beats me... there are several places within an hour or so where you could rent for dual, though I doubt that they would let you solo.
n5296s / n9888s