Well this response is a bit late, but if you are still reading the board....
A cable is a facility on a lake that has tower on the sides that suspend a cable driven by a motor. There are generally 6 to 8 carriers that will engage a ski rope and then pull the boarder/skier around the lake. There are 2 cables in FL, 1 in TX and 1 new one in Kansas city.
They have slider toys to hit for jumps and inverts. Plus you can do inverts right off the water because the cable acts like a spring and will launch you off the water if you edge hard enough. The following page has links to the US cables...
www.cablewakeboardtour.com