Hi GG - Welcome to Club Arnage,
I have not stayed at CPR before - so I cannot help with that - sorry.
There should be plenty of other Le Mansters around on that site who can help and advise either from here or once you are there!
If you get really stick about the trams / transport, PM me - I have a secret agent in Le Mans who can find out the information for you......................
1/ Sounds to me like your best option would be to leave Mrs G at the Campsite and take the car to Parking Rouge.
Stick a small tent in the back with the bike just in case.
A few beers and soft drinks, a baguette and some fromage - just in case you need to kip in the car and feel a bit peckish!
As Rhino says - there are a lot of places to eat and drink around the circuit!
A small towel, toothbrush and B/O basher will suffice if you need to be clean - there are showers that can be accessed from the campsites and in the village area.
2/ If you need to pitch a small tent, I don't see why there would be a problem getting into most on-site camping without a camping pass (you only need a pass to drive the car in).
Either hook up with someone on here and 'borrow' a bit of space (you are more than welcome to stick a 2Man up in our plot!)
_or just walk in_
If you get asked why you are taking a tent into the campsite, just explain that you're taking a tent to stay with your friends who are already in there!!
3/ If you want to get down to Arnage or Mulsanne then worth taking the bike in the back of the car.
The buses last year were taking about 2 1/2 to 3 hours for the round trip (not including watching time.......................budget 4 to 6+ hours!!)
There is NO ACCESS to either from inside the circuit during the race - you need to go around via Arnage village. Although it is still a bit of a trek, especially as these areas are best seen at night, it could be tricky in the dark, AND if you don't know where you are going, however there will be plenty of people around to ask for directions - half of them will be drunk and the other half will will be French (AND drunk)......
4/ Getting the car on and off circuit during the race is always an absolute NIGHTMARE
AVOID.
Maybe see you there!
clk