Enhance the color of the sky and other light areas to increase contrast and saturation.

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1. Open the image for editing.

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2. Duplicate the current layer (Ctrl+J) and change the blending mode of the new layer to Difference.

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3. On the new layer, apply a Shadow/Highlight filter (Filter> Adjustments> Shadow/Highlight) with the following properties:

Shadows: 0%
Highlights: 100%

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4. Duplicate the Background layer (Ctrl+J) and add a layer mask (Layer> Add Layer Mask> Reveal All) on the new layer.

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5. With the layer mask selected, use the Apply Image tool (Image> Apply Image) to apply the following properties:

Layer: Merged
Channel: RGB
Invert: Unchecked
Blending: Multiply
Opacity: 100%

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6. Delete the top layer.

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7. On the top layer, use the Brightness/Contrast tool (Image> Adjustments> Brightness/Contrast) to apply the following properties:

Brightness: -25
Contrast: +50

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8. With the layer mask selected, apply an Auto Levels (Ctrl+Shift+L) then change the blending mode to Multiply.

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9. Rollover the image in this step to see the original image before this technique was applied.