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

Here is Why You Need An Adapter

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

Bonaire

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

Type A

Type C

Grenada

In Grenada, outlets of type G are in use.

Type G