It used to be that you could drive about half-way without a temporary car permit. Is it still the case?
Yes you can drive to the Tip of Baja without a car permit, it is part of the FREE ZONE!
As I understood it this is still technically true, but there is a way to go around the checkpoint midway down (ill see if i can find the blog from the couple who went around).
I dont think the checkpoint was even manned when we blew past it- so a guess you could play the odds.
At Guerrero Negro they only check for your tourist permits, no vehicle permits!
A few weeks ago they didn't even do that, just the bug spray deal.