You Do Need power plug adapter while traveling from Åland Islands 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 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

Sint Maarten

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

Type A

Type B