The Westsong Walkway Adventure Lab has 5 locations on the West side of Victoria Harbour. This bonus cache is right there as well. No extra walking required. You will have to be stealthy as this is an extremely high muggle area. You are looking for a camoed preform hidden under a man-made structure. Cache should be easy to find. Difficulty is 2 because of the muggle factor. Please re-hide well.
To obtain the coordinates for this bonus cache, you must complete the adventure. The coordinates will appear when you click the journal entry for the 5th and last stage.
To complete the adventure, you must install the Geocaching Adventure Lab onto your phone.