You Do Need power plug adapter while traveling from Falkland Islands to Saint Martin.

Here is Why You Need An Adapter

The outlet and plug type used in Saint Martin are C and E and in Falkland Islands is G. This is how they look like.

Falkland Islands

In Falkland Islands, outlets of type G are in use.

Type G

Saint Martin

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

Type C

Type E