I was writing entirely story and plot. I had missed a huge element of what made the original D&D: what's out there? Whats' in there? What was missing was that sense of "let's find out;" exploration for exploration's sake; discovery for the thrill of discovery.
I've figured out how to add an opportunity for exploration and discovery, but what they hell do they actually find there? That's a good question. That's a good problem to have.