Great video, Ferret!
I've only ever done some snorkeling (which I love) when on vacation in the Caribbean and Florida Keys. In the keys I ran into some fish (don't remember the name but it was long (at least six feet) and silver was a little indimitating being that close to fish that is bigger than you in their turf. Barracuda on the other hand are scary as they have these sharp, menacing teeth sticking out, so I got out there.
I'm sure you see a lot more when you go scuba diving, but personally, I'd don't think I could do scuba. I'd be way too paranoid that I'd drown if I go too far deep. Maybe you just get used to it though.
Here's a few pictures when we went snorkeling on our honeymoon last year. We are going on another cruise in january, so we'll be doing more snorkeling then!
Me at Stingray City in Cayman Is.:
Here's another of me swimming towards the Barrier Reef in Cayman Is.:
More of the Barrier Reef:
From that last one you can see there's not much space between you and the reef. You had to careful because the current would brush you right against the coral. Luckily, it wasn't real sharp. That happened to me another time and I got real scratched up.