Map 1:

[IMG]http://i60.tinypic.com/jijl9y.jpg[/IMG]

Brown - Cave entrance (they all connected under the earth via a 10w x 10h tunnel)
Grey - Stone pillars 30 feet high. These have torches of inextinguishable fire on each side of them about 5 feet up (the fire is extinguishable if other things are caught on fire with it)
Dark Blue - Rivers
Light blue - open sky
Green - Plains
Dark Green - Trees 15-20 feet high.

The Arena itself is a 200 diameter circular floating platform. It is about 40 feet thick and the edges are jagged cliffs.