In my opinion their should be themed dungeons, example:
Forest type: T-rex,Mushrooms,Potatoes and such
Haunted House:Wolves,Zombies,Vampires and such
Dungeons:Smokys,Gloks and such
Volano
ievels,Dragons,Lava type Gloks and such
Cave:Orcs/Ogres,Golems,Bats and such
Beaches/Ice Caverns:Heivels,JellyFish,the ice bomy thing and such