a really nice image you have there, I imagine I could get lost in the details when this is big! What I dont like is the contrast and the colors, caused by the sun. I would convert it to b/w, and then work with curves on the contrast. I would:
1. Decrease the light tones quite a bit so these become comfortable to the eye
2. Decrease also the darks so they approach black
3. Leave the darker middle tones a bit lighter
It is a bit tricky so I'll attach a quick image, still not optimal, but more pleasing for my eyes. From this point you could go on with a second curve to refine your result. At least thats how I approach it You also might want to experiment further with the curves, going for entire different looks. Also, you might consider shooting with less contrasty light.