St Lucia is also as good a choice as anywhere in the Caribbean for secluded, upmarket, romantic places to stay. Your hotel room might have an outdoor garden shower, a private plunge pool, a hammock for two on its balcony, and a view of the thrusting Pitons. Nature and fertility will be all around you, and wherever you go you trip over wedding ceremonies and loved-up honeymooning couples.
That said, a week on St Lucia doesn't have to be all about candlelit meals for two every night. There are also good family-oriented hotels, and you can party the night away in Rodney Bay Village, the island's only resort.