You Do Need power plug adapter while traveling from Papua New Guinea to Sint Maarten.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Maarten are A and B and in Papua New Guinea is I. This is how they look like.

Papua New Guinea

In Papua New Guinea, outlets of type I are in use.

Type I

Sint Maarten

In Sint Maarten, outlets of type A and B are in use.

Type A

Type B