I’ve been a fair few times. Don’t leave the track early, go home on Monday instead. Head into the town on Sunday evening for a civilised meal to recover for a weekend of fun.
If you are flying, look at going to Paris and picking up a hire car and giving yourself 5 hours ish to drive down.
You might be limited on camp sites choices for this year now, but with calling around the main Motorsport holiday companies.
Pack some head torches, light camping gear and get up early for the showers.
Get as much food and drink as you can from a single supermarket trip to make life easy as possible.
Ear plugs for the noise in the camsite. Watch the bumper car on the wooden track on the fairground, but don’t let your sun go on unless he wants whiplash.
Have a fantastic time!