1. Staightened and cropped via the measure tool along the horizon.
2. Edit-Convert to Profile - converted to LAB color.
3. Made the curves steeper for both the A and B channels (about 10 for A, 15 for B).
4. On the L channel in curves, moved the mid-point about 5 points up (darker).
5. Created a duplicate layer, unsharp mask 20-200-0 on the L-channel (Ctrl-1).
6. Flattened image.
7. Edit-Convert to Profile - converted back to aRGB.
8. Unsharp mask 20-60-0.
9. Resized/sharpened/converted to sRGB for web.