Update: 1 night is 168 php
Still need to watch out under trees (sap and crap)

 

I recently asked this at the gate. Cannot recall the exact price, but sure it was something like P185, not P400. There's two variables here: 1. My memory. 2. Could have been a guard just guessing.

 

What he said, just do not park under any of the trees

 

I have done it many times but that was a couple years ago. It cost 400p a night (I think if I remember right) and does not require any documentation. It is safe and the car is parked in the lot closest to the arrival doors.