Wander00,
I had to look up Biscarosse. Definitely try to get a floatplane flight.
As a long time glider pilot, I am forced to admit that float flying is the most airborne fun I’ve ever had. In my case, it combined safe mountain flying, in the sense that there is always somewhere to put a floatplane down in the case of an emergency, with “simply messing about in boats”!
Floatplanes have an advantage over flying boats in glassy water takeoffs. Once you are on the step, you can use the ailerons to “lever” one float out of the water, thereby immediately halving the hydrodynamic drag.