[tevake]

You are in for a great trip!
I drove over from central Germany in 2010 for the L M Classic, truly fantastic experience . It's quite a trip each way! The middle part of France is somewhat like our plains states vast ag fields and open spaces, to bad they don't have autobahn speeds there.

The station wagon I rented served nicely both on the trip back and forth and as a sheltered place to catch some winks while there, there is a lot of noise from the track and from your neighbors in the camping area! Major partying going down. :-)
Good idea to stock up a cooler with food and drinks with lots of ice before entering the track area. There are vendors there but they may be a long way from where you camp.
A folding chair with straps for carrying is good to have, I found different vantage points to watch from and did a LOT of walking around to see as much as possible. So it was nice to be able to sit down to hang in good spots for a while.

I had tickets for The grandstands near the start/finish line across fron the pits, but the noise there kept me from spending much time there. Have ear protection with you.
The Classic was a true bucket list experience for me. And with Porsche debuting the new Hybred prototype this year at the 24hrs it should big fun .
Take lots of pics to share with us.
The parking lots and camping areas are a great car show in them selves.

Cheers Richard

Ps. This is a true endurance event for the spectators too!