I won't try to tell the whole story. And there is a whole description of the story that the album tells. It the key to the song's messege lies in certain key words. Maybe the 4 winds represent all the different people of the world. Whatever the 4 winds are, they converge at the 4 winds bar.
Light is also a common thing.
More than likely this a metaphor for heaven and hell. I think the real key lies in who Suzie and Karrie are. Suzie is obviously someone the narrator cares for deeply. The narrator calles her Miss Karrie nurse, and she reads a map. All this is just possiblities for symbolism that is present throughout the song.