If you're having your wedding outdoors, be prepared for unpredictable weather. A tent is always a good idea; and make sure any rented furniture won't blow away in a big gust of wind.
When thinking decorations, you might want to make a list of words that come to mind when you dream of the tropics. Your preliminary list might include words like warm, sun, citrus, calm, pastel, dreamy, waves, shells and nature. From there you might choose decorations with citrus and pastel colors, table centerpieces made of shells and candles, and large urns filled with sand holding tiki torches. Incorporate a variety of different-sized, white candles into the reception, placed in seashells or clear glass votive holders. Wrap chairs with white or sand-colored tulle to create an mood of ocean waves. A more extensive project could include a pre-wedding gathering at which bridesmaids make wind chimes from seashells.
Music at a beach wedding is most beautiful if kept simple. A singe guitar or ukulele player can be very effective. Or, a CD of atmospheric music played softly at the reception can add a romantic feel.
If your location isn't already surrounded by tropical flowers, consider these varieties: Orchids, Dendrobium, Gingers, Bird of Paradise and Anthurium. Wedding leis are beautiful when made with a single variety of flower: white orchids are appropriate for both the bride and groom.
You may want to place shell-shaped chocolates on the dinner tables. If you are serving alcohol, prepare your bartender with ingredients for margaritas, mai tais pina coladas and mojitos.
The menu might include seafood: oyster shooters, grilled salmon, tuna steaks and a fresh island fruit chutney with mangos, papaya and pineapple. A casual crab feed would be another fun option.
As the sun sets on your special day, your guests will leave inspired by the island air and with the lingering tastes and smells of the tropics. And the two of you can walk off into the sunset, enjoying your well-planned day.