But I'm going to remake a world to get more monsters in it. Seems like everyone's getting creepers and skeletons everywhere, which really makes survival a necessary proposition. My maps are from Ye Old World (pre 1.0.6 I think?) so their monster population is sparse.

Still, I enjoyed making my snow mountain keep, with greenhouse on top and observation turret, and this lava flow (very close to the surface) went on and and on and on and on into the deeps, which would have been fun to follow. I'm sure I'll remake a mountain keep and find another good lava flow :)