You Do Need power plug adapter while traveling from Sint Eustatius 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 Sint Eustatius are A, B, C and F. This is how they look like.

Sint Eustatius

In Sint Eustatius, outlets of type A, B, C and F are in use.

Type A

Type B

Type C

Type F

Puerto Rico

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

Type A

Type B