Put your camera in a plastic bag [freezer bag or similar] if you are worried with just a small hole for the lens to poke out.
As Kort said Flash is the secret, that is what will freeze the water action and make it sparkle, so make sure your flash is switched on.

Message edited on: 03/02/2006 10:19

And every one said, 'If we only live,
We too will go to sea in a Sieve,---
To the hills of the Chankly Bore!'
Far and few, far and few, Are the lands where the Jumblies live;
Their heads are green, and their hands are blue, And they went to sea in a Sieve.

Edward Lear
http://www.nonsenselit.org/Lear/ns/jumblies.html