I think the best map is Norah's Drain Pipe (Nora Sewer). The creatures are the cutest in game, the map is beautifully designed and the music is perfectly suited. Below is my imagination running from the influence of such a great map...
You walk through the entrance and notice how dark the place is, but it is a relaxed dark. After a short moment of exploration, you come across three drain pipes with unknown destinations. You use the good old method of eeny meeny miny moe to make a selection and set foot down the left pipe.
As the drain gets darker, you suddenly hear a set of blinking eyes behind you (Nora Joe's eyes really do make blinking noises!), you turn an cast Thunderbolt! and the body of a Nora Joe now lays face down in front of you. You feel sorry for the poor creature, but it was for your own survival.
You start to consider the life forms down here and what you might be facing. Suddenly, "Rahh!!", a Nora Big leaps at you with great force! The creature manages to push you to the ground but you are able to lift your staff and cast another Thunderbolt! The Nora Big now suffered the same fate as the Nora Joe.
You're startled by the attack and startled by the creature's bum and wonder why it isn't wearing clothes. In your frightened stupor, you hear some noise to your right, you turn your head and notice a dozen set of piercing red eyes in the not so distant darkness. Their silhouettes now become visible and you realise it is an army of Nora Mummies!
Without hesitation, you run for your life! You suddenly realise you are lost in this Nora labyrinth and cannot remember the direction of the exit. You lose your footing and fall straight down a pipe, twisting and turning towards a source of light. You land somewhere outside, you look up and spot Don Giuvanni. "What are you doing in the reclamation area?" he questions. You let out a sigh of relief... you are back in Aquarius and you vow never to invade the land of Nora again.
I hope you had as much fun reading this as I did writing it