hi shcp, what a name !
, hi suzi
it depends where you take your swim at belle mare plage, if in front of a hotel, then it should not be a problem, but further down at belle mare plage public beach i wouldn't go in without shoes - many sea hedgehog, sharp coral pieces and sometimes a stone fish can pass your way.
during low tide watch out for the corals, they are sometimes only 30 cm under surface.
PS: i life at belle-mare, nice place !