Flight to Le Mans
I went year before last, both Heli and Fixed wing is straight forward.
you need a landing slot, but most importantly a departure slot.
you can camp at the airport, there is a mini bus service to the track (10 euro ?), though its only a short walk. Take a small tent and roll up mattress, grass is hard !
there is little opportunity to feed on the airport side, most facilities in the track (expensive) or in the town (busy), again a short walk from the track.
I flew heli, home, Lydd, LFAT, Deauville, Le Mans - Jet fuel at Dueaville MUST be pre-booked, else the airport manager gets VERY eggy !, has refused to supply !
You can get fuel at Le Mans but a long wait, best to plan a fuel stop before and after. Its normally a scramble to leave, so either plan to depart just before the race ends, or expect to wait a while.
Night flying in France (night VFR) is not possible (may have changed), the race finishes at 3pm so if you can't get an early departure slot, plan another night under canvas.
There is a lot of 'sight seeing' and 'news' helicopters active during daylight hours, I recall there is a Temporary Restricted Area around the Track so I don't think you can move during the race, I am sure you can't fly the track (shame).
I have been several times, each time by air, its a good trip, all worked well, landing & parking fees were OK, camping is fee for visiting aircraft, the night racing is worth seeing, the atmosphere excellent, rain can spoil things a little.
I would avoid Deauville, plan an alternative. The route is simple enough avoid the ZIT around the power stations on the north coast, there is some tight space near Le Havre and there is a Nuclear power station(beware the franch are rumored to get very nasty if you drift near one) . Flight to France is simple enough, file flight plans for both legs, prob best to fly the short route, Le Mans can be a customers airport (I think Customs are there during the race) but check they will be, else you may need to land elsewhere in France (LFAT) to clear customs on both legs. when you plan your route you will find many routes in France appear to be blocked by restricted airspace, generally these are only active a few hours per day (close at lunch time, its france after all !), most are inactive at weekends, most can be crossed with crossing clearance, worth a detailed check as some are fast jet paths (they are Fast !). you will need life jackets for the sea crossing and check about ELT's that's a moving target !, most french aircraft carry them, I don't know if they mandate them for visiting G reg.
The can get route carts from Transair that will ensure you have the correct and upto date carts and plates - prob worth it, also take a printed intercept rules document - I recall this is mandatory.
hope this is of some help, check the above for your self.
Ian