You Do Need power plug adapter while traveling from Sint Maarten to Balearic Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Balearic Islands are C and F and in Sint Maarten are A and B. This is how they look like.

Sint Maarten

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

Type A

Type B

Balearic Islands

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

Type C

Type F