You will be amazed at how much time you spend in your swimsuit. I would suggest bringing 5 swimsuits or 3 and some Woolite to wash them out. Then I would bring 4 evening outfits. You'll be amazed at what a short amount of time you are in your evening clothes and you will be able to wear them again, but know you can always send them to the cleaners if need be. Also, don't bring a lot of day wear unless you plan excursions. If you are at the resort all day then you will be in your swimsuit. And remember cover-ups.
If you are checking luggage, then pack a carry-on with one change of clothes and 1 set of swim wear. Remember a pen for immigration forms on the plane.
Have a wonderful time and you are wise to not over pack. It is amazing how this can be done and we've been to Couples 5 times and I still over pack. LOL
Juliann & Jeff
Jamaica Soon Come