For dark rides, you need a large aperture (small number). Then you want the fastest shutter speed and lowest ISO that you can get away with.
Remember, shutter speed freezes movement --- But a faster shutter speed also lets in less light. So it would be great to shoot at a shutter speed of 1/10 to get lots of light, but you'll get an image totally blurred by motion and camera shake.
Though it partially also depends on your focal length, you will want to keep your shutter speed at between 1/50 and 1/100.
ISO... lower ISO is cleaner and better than high ISO. But you will need high ISO.
And you really won't get many decent shots with the kit lens in dark rides. You will need a lens with a wider aperture.
Pirates of the Caribbean by
Havoc315, on Flickr