You Do Need power plug adapter while traveling from Benin to Bonaire.

Here is Why You Need An Adapter

The outlet and plug type used in Bonaire are A and C and in Benin are C and E. This is how they look like.

Benin

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

Type C

Type E

Bonaire

In Bonaire, outlets of type A and C are in use.

Type A

Type C