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Using adjustment layers instead of direct adjustments has the same advantage as using layer masks instead of the Eraser Tool (E) I mentioned earlier - everything is reversible for the whole time. You don't need to count on your History, you can change the adjustments whenever you want.
As I said add new adjustment layer Hue/Saturation and set the value Saturation on -100.
You want to this adjustment affects only one layer below = SKY and not the rest of the picture. To achieve that right click on the adjustment layer and select the option Create Clipping Mask.
Second thing which should be done is to increase contrast a little. Add new adjustment layer Levels and set the Input Levels on 43; 1,38; 240.