I love the last one to be honest. I'm wondering what it would look like cropped, cuttinf off the top of the image and the last part of slide. It would leave an optical illusion of sorts with the reflection of the same image at the bottom.
#3 is an interesting shot by itself, but I would love to see a kid's reflection, or his feet/ankles at the top of the frame like he's about to slide down (yes, I realize the top of the frame is actually the bottom of the slide, but still ...)
I think there are many ways to experiment with that picture. It is a good stage, in other words.