You Do Need power plug adapter while traveling from Vanuatu to Palestine.

Here is Why You Need An Adapter

The outlet and plug type used in Palestine are C and H and in Vanuatu is I. This is how they look like.

Vanuatu

In Vanuatu, outlets of type I are in use.

Type I

Palestine

In Palestine, outlets of type C and H are in use.

Type C

Type H