sentence: We see a title over a video screen. sentence:  We see people riding tubes down a steep slope. sentence:  We see a lady ride as she holds a camera. sentence:  We see a member of the staff put a person on the tow line and see them go up. sentence:  A boy in goggles holds a camera on himself as he goes down. sentence:  We see a man push a boy down the slope. sentence:  We see the ending title and credits.