Anywhere in the game on the main island (not in a building),
walk forward until you cannot move anymore. Then, hold Forward
and repeatedly press [Keypad Plus]. If [Num Lock]
is on, you should start to see random Lego people begin to appear
in front of you. Keep holding Forward and you may start
flying. You can now move anywhere on the map, including past the
edge of the water. Sometimes you will randomly get warped back
to where you really are.