Brides.com: The World's Top 20 Honeymoon Destinations. 4. St. Lucia. What makes St. Lucia a prime honeymoon destination? It's world-renowned for its all-inclusive resorts, among the best in the Caribbean. St. Lucia-bound newlyweds also enjoy tropical weather and scenery, endless beaches, rain forests, gardens, national parks, and a drive-in volcano. That's a lot of adventure for a teeny-tiny island.