Visited Saint Jean de Monts, just north of Les Sables d'Olonne, about mid 70's on a touring/camping holiday.
It was a superb liitle spot, camping in the forest, eating pizza at the little bars at the edge of the forest.
About tea-time each evening, young people would hire the 2, 4, 6 or 8 seat cycles and literally race around the little resort, ignoring any traffic rules, for about an hour.
If you weren't lucky enough to participate, the next best thing was to have a few beers at a corner bar and watch the fun.
We returned there, about four years ago for a brief visit. It was like Blackpool, completely commercialised, grid locked with traffic. One road in and one road out, 'cos you wouldn't have wanted to stay long and the prices had gone through the roof.
We did carry on down to St Giles de la croix? or something like that and it reminded me of what St Jean de Monts used to be like 20 odd years ago.