You Do Need power plug adapter while traveling from Saint Vincent and the Grenadines to Puerto Rico.

Here is Why You Need An Adapter

The outlet and plug type used in Puerto Rico are A and B and in Saint Vincent and the Grenadines are A, B and G. This is how they look like.

Saint Vincent and the Grenadines

In Saint Vincent and the Grenadines, outlets of type A, B and G are in use.

Type A

Type B

Type G

Puerto Rico

In Puerto Rico, outlets of type A and B are in use.

Type A

Type B