From the map you will see that the route takes you to/round Nantes.
If you are travelling south from Rennes, follow part (A) and then part (C) below.
If you are travelling form Paris through Le Mans, follow part (B) and then part (C) below.
A) From Rennes, you approach Nantes on the N 137. When approaching Nantes, go careful & SLOW DOWN. If you miss the turn-off you will suddenly find yourselves in the city itself!
Turn-off the dual carriage-way, signs to Vannes, Noirmoutier , Bordeaux , Nante Atlantique, and Periphique Ouest (Effectively the 1st turn-off approaching Nantes)
This will lead you onto the circular road around Nantes, passing to the South of the city. You cross the river Loire and continue on round the two lane circular route. Keep following the signs to Bordeaux.
Turn off the dual carriageway Periphique road, again following signs to Bordeaux at junction 48a. GO TO PART C
B)  From Paris, you are probably travelling on the A11 / E60.
Leave the A11 at junction 22 and follow the signs for Bordeaux ; Aeroport Nantes Atlantique.
At junction 43 turn left towards Cholet, go over the river and immediately turn right towards Bordeaux.
At junction 48 turn right onto the AutoRoute towards Bordeaux

c) You are now travelling South, and away from Nantes, still following Bordeaux.
After only two or three miles, you find that you are approaching the motorway signs for Bordeaux, with signs indicating that you will soon be on a péage section, continue, but turn off just before the péage, sign posted to La Roche sur Yon par RD. It is the next junction after the aire ( or rest area).
Continue following signs towards Machecoul / Challans. You finally come to a round-about, near Machecoul, where you turn left,  towards Challans.
On the outskirts of Challans you are led onto a new dual carriageway towards Noirmoutier. Stay on the dual carriageway, do not turn off for Noirmoutier. The road becomes two-way and at the roundabout take the first exit right to St Jean de Mont. Continue straight on and you come to Le Perrier. Go straight on at the traffic lights.
Next roundabout (Super U Super Market) take the third exit (LEFT) towards Orouet.
Next roundabout take the first exit (RIGHT) towards Orouet.
Next roundabout take the second exit (LEFT) towards Orouet.
About 2 miles along the straight road  turn RIGHT by the Oasis Hotel/restaurant and Les Genets is 1 mile on the left. Camping Acapulco is 500 yards further on on the same side.