Thought I would respond to each person in turn:

Atapene,
The only thing positive to come out of lightsabre duels was George Lucas's bank balance. Luke lost a hand, Obi One suicided and countless families of the Empire were left fatherless. And while it is true that Darth Vader wore a snorkel (of sorts) he was also consumed by the dark side. He only came good after he took it off.

Belle,
I did try underwater hockey a couple of times but was put off by people’s reactions when I told them what I was doing. Their first reaction was usually one of mild curiosity but this was quickly followed by distain. I haven't got this reaction from anybody when I have mentioned Aqua Challenge. Their usual response is "Wow! That sounds really interesting. Do you have any associated literature or promotional material? Perhaps I could subscribe to your magazine."

Duck,
Your species is semi-amphibious, laughing underwater should hold no fears for you.