Hi Divin - my girlfriend and I did the Zip Lining trip combined with the Cave Tubing. It was fun, but since I am afraid of heights, I was scared to death. There are TWO cables for safety, and you are always tethered, the entire time. There's a bit of a walk, uphill, to get to the first platform, and you have to repel off of the last platform. It definitely gets your heart beating.
Have fun, if you decide to go!