I love NH in the fall - the bright clear skies, the rich autumn colors. I am not sure about the choice of having the water park be the focal point for the image
While there's not really a main subject, the waterslides are covered by trees, I think you might have received a higher score if you had used the full size allowed by DPC 800 pixels.
I not you are using the 'old' size of 640px instead of 800px. With an image that has as many elements as this, those extra pixels could have helped you. There is a lot going on here, and lots of elements, like the blue slides, that are partially hiden, making for a very busy image
This has some compositional flaws. Anything that is potentially subject matter in the photograph is eclipsed but the foreground trees. Also, looks like perhaps too much sharpening -- I see haloing in the mountains.
looks like a great place to have a holiday. Its a nature shot but also structures which tells me there shoudl be people..having fun. That rather makes the pic empty for me. Would love to see this place in real life