GlassJaw
Hero
derbacher said:SPOILER ALERT!
Toward the end of the series, the lake at the center of the volcano starts to overflow the city. It is pretty important to the story, so if you move it, you need to keep a large body of water in the center that will overflow for some reason. The PCs are expected to use wands of control water to keep the flow back. If you can deal with that, everything else should be easy to place somewhere else.
This actually happens in the 2nd module. To update my previous post, there is a chance that the volcano erupts. In any case, that the city is in a volcano features prominently throughout the AP. You could even consider it one of the major NPC's (and a very cool one at that), right alongside everyone else.