I feel so silly. I had the water shader before the powerfractal, change them around and it looks like good water again!
I also spent some time on the clouds and made the rocks a bit smaller. I am happier with this one, but as I type this, I have another render on the go. A few boulders scattered amongst the palms and some more colour variance for the grass. It looked a little dead for my liking.
Iain