Las Caletas, Mexico of course!! (BTW I'm pretty sure we're all biased and will all vote for our own..lol)
There are lots of pretty places but how many can you take a private open-bar boat to and from and feel like you are on a deserted island?
A few selling points:
~ Unparalelled privacy (no onlookers, the only people at your wedding are your guests/staff)
~ No roads = no city noise/traffic
~ Nature!! Look left - no hotels...look right - no hotels...look straight - ocean!
~ Jungle & beach in one
~ Bridal casita - high up in the jungle, it's yours for the day complete w/jacuzzi and next door to the spa
~ Surprisingly affordable and consistently the best wedding coordinators I hear about here
I'm sure Ann will be here soon to echo these points and make some of her own

)