It's the super long zip line.
The Mt. Flyer is NOT the slide down the mountain (what Richard describes is known as the Alpine Slide). The Sun Mt. Flyer is a long, steep zip ride down the mountain.
I think it's the slide ride down the mountain. They use gravity and a sled that has wheels and a break handle in the middle of the sled. You sit down and let gravity help you down the mountain side. I will say it's fun and really not for people that are overwieght. I say this about overweight people because I am one of them and I did come to a complete stop had to pull my self along the track to get going. The second time I had to get of the track to let people go by.
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