In addition to the Aqualand in Frejus, there is also an excellent Aqualand in St. Maxime, only 35 minutes from the house in La Bouverie.
This is part of the same chain of waterlands as the Aqualand in Frejus, and you can visit their website for more information: http://www.aqualand.fr/Sainte-maxime/
Villa Soleil 