Originally Posted by
robr
Even when you hire a guy to pick up your family and take them on a 10 hour private tour in his land rover? That's crazy to us Americans you wouldn't tip for something like that. I realize tipping is never an obligation, it's not in the US either, it's supposed to be for appreciation when someone goes above and beyond. But as they say, when in Rome..... Or Oz

Yes, absolutely no need to tip. You are paying money for the tour, the tour operator you paid employs someone to perform the tour and pays him for that.
If you think he went over and above I strongly suggest you provide that feedback to his employer rather than tipping him.
Also added some comments on your itinerary above.