My wife did it a few weeks ago and enjoyed the experience, but didn't think it was worth the money overall. She said the time in the air was really, really short and the vast majority of the time is spent just sitting on the boat (getting to the spot, or waiting for your turn to go).
On the flip side -- if it is your dream to try parasailing -- you're there, they do it, and you get to fly above the Caribbean which sounds like a blast even for a short period of time.
I will put a plug in for the jet skiing just because you do spend the vast majority of the port adventure actually jet skiing.