Wow....it's pretty interesting to see the differences in people's details of Beastly Kingdom. (or Beastlie Kingdomme, from what I understand. Something about medieval spelling.)
From what I've heard, the land was supposed to be divided in two, good and evil, as previously stated. The Quest for the Unicorn maze was to be the star attraction of the "good" side, whereas Dragon's Tower, an inverted coaster, would dominate the "evil" side.
The storyline I remember for Dragon's Tower was that you were going to help the bats take the treasure from the dragon who guarded it. The train seats would look like melted cauldrons, and bats would be above, carrying you. During the ride you would come face to face with a large, jewel wearing dragon, and launch out. After which you would go through typical roller coaster elements, of course with theming.