You Do Need power plug adapter while traveling from Papua New Guinea to United States Virgin Islands.

Here is Why You Need An Adapter

The outlet and plug type used in United States Virgin Islands 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

United States Virgin Islands

In United States Virgin Islands, outlets of type A and B are in use.

Type A

Type B