Get on your horse and go to a place where there are two walls on each side near the transition area (for example, the entrance to the beach). Get as close as you can to the edge of the screen without going to the next area. Have your horse touch and face the right wall. Get off the horse. You will be off the screen but still able to move left and right. To exit, just move back towards your horse and you will instantly move to the area you were near.
