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You'll need to consider a few things: table settings, which dishes to serve, music, and illumination. Yachts typically have tables below deck, but you naturally want your candlelight dinner in the deck. Use a crate or something similar instead of a table for stableness. If convenient seating is not available, you'll need to use deck chairs, so get them to available on your ship. For worries about items moving about, find a no-skid mat to set things on (you can shop for no-slip rug pads this way at LL Bean : nothing will slide around if set on these!).
Keep things to a minimum: a dinner plate, some sort of salad plate, silverware covered in napkins, and plastic wine glasses. Have towels stowed near by to mop up any spills which will occur with a minimum of trouble.
Atmosphere and what to eat
Now, food. Pre-made salad is almost a given, and that keeps well. Desserts should be pre-made and pre-cut, stored on their own dishes. Good main dishes include lobster for those who have a place to hot it quickly (if you're tied to a microwave, put a dish of water in along with the lobster to humidify the air and keep it from blow drying), sushi, and caviar. This particular language bread rolls are excellent served cold with butter. Steak may be out, as it's difficult to prepare quickly and easily. But really, your important ingredient could be the right wine. Tortola is not really known for the efficiency of its wine cellars, so if you're picky you might want to bring your own from the mainland.
Music may be provided by the ship's systems or maybe a stereo you bring with you - or you can anchor near one of the many beach bars on Tortola and also the other islands. Bomba's Shore Shack at Apple Bay, Tortola, for instance, is one of the wildest party bars in the British Virgin Islands, together with on full moon days to weeks music and partiers discharge out onto the shore nearby. Imagine sitting under the stars with your beloved, listening to the distant sounds of music together with fun, while you two can just like a loaf of bread, jug of wine - and one another, there on the private deck to your yacht. Romantic perfection.
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When you're a guest for a party, you want to own fun, sound intelligent together with interesting and, unless you had been just dropped off these from Mars, you want to look good. Candlelight