You Do Need power plug adapter while traveling from Åland Islands to Aruba.

Here is Why You Need An Adapter

The outlet and plug type used in Aruba are A, B and F and in Åland Islands are C and F. This is how they look like.

Åland Islands

In Åland Islands, outlets of type C and F are in use.

Type C

Type F

Aruba

In Aruba, outlets of type A, B and F are in use.

Type A

Type B

Type F