I think you're right Yog... this is a pretty good shot considering it came through a bus window. If you intended to have that much of the sky in your composition, then the dynamic range solutions that Jonathan and others provide are sound. If you weren't shooting from a bus, bracketing RAWs for dynamic range would probably be your best bet.
If you were still shooting from a bus, I think the only solution would be to shoot to the right for your most valued portion of the scene. The best part of this scene is in the middle and lower middle, where the bulk of the landform occurs and the sky isn't too blown. In a situation where you don't have a chance to sit your tripod down and take the time to bracket, I believe that the solution is to limit your composition such that you expose for your most valued element, and leave most peripheral details (which might be prone to blowing) out of your composition. Zoom in, such that you leave out that top portion of the sky; if you were using a prime lens, then the next best thing is to crop it out. You could actually create a pretty strong shot by cropping out most of the sky and a small portion of the bottom... there is a distracting foliage reflection in the bottom right corner. It doesn't add anything to the shot, so it's in your best interest to either decide to include a little more of the foreground to include that tree (it might possibly give the shot some scale and distance), or completely get rid of it.
I think the key is to learn to pre-interpret scenes with respect to the capabilities of your camera, and then compose such that you emphasize the strengths and minimize difficulties and elements which you might not need. It's far better to do that, than trying to solve shortcomings in post-processing.