I was on that beach in south france a little while ago, there is nothing i can think of thats tall enough. And the ladies that walk around topless need to put there shirt back on!
I might be totally wrong, but there was something jumpable that we passed whilst driving from Gap to Nice (whch means it could be absolutely miles away - this was a few years ago and the memory is hazy).
On the other hand, i don't base (yet) and am (unfortunately) not local to that area!