At least, its not the kind of bike meeting you had on some of your beaches… well should be
No scooters either.
250 000 visitors? Probably one more this year. Yes its mental and they have to refill the fuel tank at some point. Electric ones have to change their batteries. The "inventor" was Thierry Sabine former Paris to Dakar organiser, good driver and good rider too.
John, you're right to say that the tide has a role to play. This is France and follow accurately any schedule is an option! They could start riding and finish swimming