Adrian, I don't think you can. The bright areas are totally burned out. I don't think that even a raw file would allow the level of recovery that this needs. The time to counter this is in making the exposure in the first place. If you want to try, you might paint some green over the white patches at a low opacity and then darken those areas a bit but I don't think it will look right.
Try CameraRAW first and set your black/white points and shadows/highlights. If you still have issues, and I believe you will; you can try isolated fixes. Frankly, I would only adjust enough to control the highlights and leave as is. Sometimes the capture reflects the actual conditions the image was taken under.
if you want to control it when exposing the image, the dynamic range of the scene will probably be too large unless a polariser is used to subdue the reflection.
John has answered your question. Below is a "heal" done with a method that works well for recovering via cloning to a separate layer a colour/texture to use as a fill for the lost detail. The layer mode is set to darken and the opacity adjusted to suit. Also often works well for skys, waves, white birds, waterfalls etc when high dynamic range or over exposure has caused an issue. It is best to use exposure compensation or bracketing at the time of taking the photo.
Last edited by pnodrog; 2nd May 2015 at 11:13 PM.
Thanks everyone.