Great tip, thanks Nathu.
The Badis (as the swimming areas are known) are also great places to go for BBQs in the evening after work. Should the grill not be already lit when you arrive, there's almost always a pile of logs nearby - much like in the forests - where you can get a fire going. While waiting for the coals to whiten (gas-grillers won't have a clue what I mean here

) you can pull your top off and run into the lake.
Then return for a bottle of
Oeil de Perdrix and Roland Sticks while you prepare the plates
Worth every penny, even with 10% reduction!