There are a few routes to the south - if you're not doing it on the peage, it would be a long list to go through....
Are you going over on the tunnel?
The best thing to do is get a large map of France and write down every town you'll hit and have this as your list... You'll be picking up these road signs as you drive down. It's quite an enjoyable exercise doing this. And then booking the hotels of course.
I think it's very wise to avoid the peage, whilst French lane discipline is superb, they will ride an inch off your rear bumper which would be quite scary in a little Morgan. The Police were quite hot on speed traps in rural locations last time I was there - so do try to keep to the posted limits.
Another tip is to have some little something visible to remind you to keep to the right. The biggest problem is pulling out of a petrol station or a parking spot and simply forgetting...
Maybe you've driven in France many times and I'm preaching to the converted.
