You Do Need power plug adapter while traveling from Tunisia to Sint Eustatius.

Here is Why You Need An Adapter

The outlet and plug type used in Sint Eustatius are A, B, C and F and in Tunisia are C and E. This is how they look like.

Tunisia

In Tunisia, outlets of type C and E are in use.

Type C

Type E

Sint Eustatius

In Sint Eustatius, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F