I love your ideas, Reaper. The map actually is at dusk, but the radiosity hates me. :P The whole canyon should be in shadow, but the sun seems to be ignoring the canyon wall.

I've been contemplating mental ray lightmaps, and I think it will definitely help the look. At the moment however, I have no idea how to do them, so I was waiting until I have the map more finalized before looking into it. Assistance would be appreciated, or at least a link to a full tutorial.