Hi Nick,
I have been for the last few years on a self-organised trips.
For some great advice have a look and join
www.beermountain.com its a great site for advice, fun and chat. Last year we had a major breakdown and were saved by fellow beermountain members !!!!
Its a great time, and one that is very hard to explain to a non-LeMans visitor, for us we always goto the same campsite ( Technopark ) its a little bit away from the track and has a very good atmosphere.
The main improvement last year was the shower, we spent many an hour making the 'ultimate' camping shower, it was self heated and powered by a boat water pump for that at-home feeling.
One of our members drove all the way from Switzerland to be with us and said he was amazed how great an atmosphere it was...
Oh and I think there is car racing toooooo !!!!!!
Other advice is to take a fridge, and make sure your windows are up if your coming into the track else you get a bit wet :-(
The ferry , I will admit our have been booked for the last 2 months to avoid the massive cost when the dates were anounced. For us we go Portsmouth - Le Harve with LD lines
www.ldlines.co.uk although its overnight the driving at the other end is only about 2:30 hours, but that depends on whre you live I guess...
Most of all enjoy, there is plenty to see & do and the fireworks are amazing... Do take care with your money & keys and lock them in a safe place, not in your tent. It not that is very insafe but the odd thing does happen.
Here's a link to a quick video of our fun & some pics.
http://s78.photobucket.com/albums/j82/beermountain/?action=view¤t=lemans1.flv
http://s78.photobucket.com/albums/j82/beermountain/neils%20CAMPer/
Have a great time and you always welcome to meet us for a beer or 2
Ian