Some couples think it is bad luck to see each other before the ceremony.
If following this tradition is important to you, all of the photos of the bride and groom together will be done afterwards.
However, getting all the formals done at the beginning has several advantages:
If your ceremony ends after dark, you might miss out on the beautiful, turquoise caribbean as a backdrop.
Flowers, clothing and make-up are fresh, and you can carefully budget time for formals.

If you feel that formal photos are important to you, set aside at least one or even two hours fort it.
Ideally, this session should finish about half an hour before the ceremony begins.

If you do formals immediately after the ceremony, please be aware that guests have to wait before they can greet you, and members of the bridal party will have to pose for pictures rather than mingle.

About 50% of the weddings I photograph have all the formals taken before the ceremony.
Talk it over with your spouse to be and see what shedule fits you best.