You might want to look at renting a private villa that would be large enough to house everyone. We did this 2 years ago on Virgin Gorda in the BVI's. We rented Adagio Villa, it has 5 BR and 5 1/2 BA, a private pool and great views. We got married on the beach at sundown on Savannah Bay which is a 5 minute drive from the villa, you could also get married on the beach in front of the villa on Mahoe Bay or right at the villa.