Ok - so this is
super over-the-top, but I wanted to show how big a change you can get quickly and (in a few weeks) easily.
I created a mask (because the top half of the picture is in good shape already) by adding the light areas of the blue channel to the red channel. I inverted this mask, and then curved it (I made the curve steeper) to enhance the contrast (of the mask).
I have attached this mask to this post, so you can see what I ended up with.
Using this mask, I applied a curve that mimics Photoshop's 'Screen' blend mode (I'll post more about this in a day or so - you can check out
http://twitter.com/curvemeister if you're curious in the meantime). This curve lightened the bottom of the image, but I needed to blur the mask to make this work properly (gaussian blur: 30px).
I applied the 'Screen Mode' curve twice (masked both times), to get the foreground bright enough, and finished up with a quick RGB curve to darken the shadows and brighten the highlights in the water. I think that the whole process took about a minute (you'll all be able to do this soon, so don't worry if any of that was a bit confusing - it won't be for long).
Again, it's probably overcooked, but...
Cheers,
Lee.