We continue our morning with a leisurely kayak on this aquifer, formed more than 250,000 years ago. The silence of our paddles allows us to travel without scaring the herons, storks and ducks who go about their business without seeming to care about our presence. After our boat trip we approach one of the fishing shelters that are scattered along the banks of the pond. These picturesque constructions from the nineteenth and twentieth centuries served as storage areas for fishing tools and as beach cabins for wealthy locals. To emulate those elegant ladies and gentlemen we take the opportunity to go for a dip in one of the areas set up for this purpose.