Scuba diving off the coast of the Island of Cavallo and the Lavezzi Islands will put you in the heart of a marine reserve which is ridden with "merou" or grouper in English.
These fish are simply massive and large in number given that they are protected from would be fishermen. You can sign up for a dive out of Lecci in Corsica www.subtortue.net or better yet spend a night or two at the very exclusive Hotel des Pecheurs on Cavallo in the Strait of Bonifacio. www.hoteldespecheurs.com The island is only about a half mile long and can easily be visited on foot or using a golf cart to discover small isolated creeks. And if you just can't make it all the way to Corsica consider diving at La Gabiniere in the marine reserve of Port Cros the Island directly across from Toulon/Hyeres. Rock fish, grouper and huge schools of barracuda await. You can sign up at www.sun-plongee.com