How about a DM map set inside a human body? You could slide down the nostrils onto the tobgue. Then drop down into the stomach and then have paths to each leg and foot and the rear end where you would fall into a toilet with a warp back to the stomach. Warps would be placed in the feet to go to the ears and then you couldwalk around in the skull and sinus cavaties and even see the brain. I have plenty more ideas but 0 mapping skill. Anyone want to take a stab at this one?