The location I marked with pins is the exact location of the water playground. The lower right is the sports center, and there is a water playground on the hill above it.
It's at the top of the valley and may not have been updated on the map because it's not long since it was made, but that location is correct. I went there today, and the shapes of the roads surrounding the water playground all match. :)
Oh, It might be helpful to look at satellite pictures if you need them!^^