I haven't been there for the modern 24hr of Le Mans. But did have a fantastic time going to the Classic A few years ago and had an amazing time there.
I drove in in a rented Volvo wagon that I car camped in for the event.
The scene in the campground and just being there 24/7 for a long weekend is truly an endurance event not to be missed.
There is good on line presents for the event with prices and details.
Here is my post of that trip.
http://forums.pelicanparts.com/porsche-911-technical-forum/560679-le-mans-classic-story-pics.html