I hardly snorkel at all in the Grenadines. I just don't find anything worth looking at.

The turtles are fun in the Tobago Cays by Petit Rameau, but not for coral or fish life.

I thinking diving would be a better bet, but I just didn't bother the last time I was there.

I'm sure if I had more gumption I could find great snorkelling, ask the locals, they'll know (and probably want to take you there for $$!)