Holiday park center parcs/landal with white water course

I am writing this message on behalf of my youngest daughter.

She has been talking about a whitewater ride on vacation for years. This whitewater ride is actually called the lazy river I think, but anyway. For her it was wild then because she was small.

She can remember a park where you could choose which way to go during the ride. Continue with the ride or take a green slide. She especially liked the choice you had to make, also because of playing tag with her sister.

We can't figure it out. Does anyone know which park she means?