Depends on how he wants to do it.
Is the journey part of the holiday if you get mydrift, or is it just a means of getting there?
Which port will he arrive at?
One route I've used is.....
Caen ( Ouistreham) - Alencon, Le Mans, Tours, Chateauroux, Montlucon, north of Vichy to Roanne, Lyon, Grenoble, then the route Napoleon to Cannes & Nice.
Most of this is single carriageway - a good 2 day run.
Avoid..... the centre of Lyon at 1700 on a Friday evening..... the middle of Nice in a midday monsoon when half the city is under attack from roadworks!!
Keep the speed down in built up areas...speed traps abound these days.
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