Check out these pics for ideas:
Art:

1. Paint the living room a light, relaxing blue
2. Put in dark hardwood floors (If it is in your budget)
4. Get a light (preferably white) rug with blue and dark brown stripes. Try looking at a furniture store.
5. Move in the furniture you have already.
6. Put a living room table in the middle on the rug (one like this)
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Or this…=&style=&IsClicked=1&CatPageNumber=2&bFromSearch=Y&Keyword=living%20room%20table

7. Throw pillows: Get some lighter colored throw pillows (light blue, or white) to tie your chairs to the room.
8. If all you have are chairs, consider getting a coordinating sofa of loveseat to go with them.
9. Decoritive accents: Vases, candle gardens, floor plants, etc. Some of my suggestions:

And one or two palm trees on the floor (live or fake, it doesn’t matter)

10. Curtains: Some sheer, fluttery curtains (preferably white or light, light blue) to accentuate any windows in your living room will give it a light, breezy feel.

11. Tying it all together: art prints. Between one and three art prints will really tie the room together and bring your message across. Here would be some of my suggestions:
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–12460937/SP–A/IGID–1436984/Salt_Cay_Turks_and_Caicos_Islands.htm?sOrig=CAT&sOrigID=7630&ui=CB1719FA18DB4D4EA4FF1E0D7029D346

I also found this website that has tips for decorating in caribbean style:

I hope that this helped!