My six year old daughter drew this dungeon a week or so ago, after watching me doing something similar. I think it's a killer dungeon, and I think it shows that she's a great fan of monsters (e.g. she always runs the monsters when we play Castle Ravenloft, and had this to say when she saw an image of Jabba the Hutt: "He looks kind.") And she's apparently a big fan of - plumbing!
Annotated version below the map, with her own descriptions.