The player locates a treasure map that has holes in it. As you can clearly see by the white parts on the map.
The player will have to then look around the environment for a shape that matches the holes on the treasure map.
Matching the map to the palm trees in the environment will allow the player to then dig under the tree. As you can see the holes on the map now fit perfectly with the palm trees in the environment.
The player will then dig under the palm trees and locate the treasure.
Using this form of puzzle instead of the usual "50 paces..." forces the player to explore the environment and enjoy all the hard work Mark is going to do with modelling the environment and yes I did rip off "It's a Mad Mad Mad Mad World" with the crossed palm tree thing.