Hi Rob,
I think that the issue is not so much the high-frequency detail as it is the overall composition - there really isn't anything to lead the eye through the scene.
A couple of suggestions ...
1. If you're going to include the foreground rocks, then get the camera 2 or 3 feet lower for a more agressive perspective, like I've done here ...
http://backup.cambridgeincolour.com/...7/original.jpg
Or ...
2. As an alternative,
Lop it off altogether ...
http://i51.tinypic.com/34fmr9f.jpg