The Caribbean has been one of my favourite places on the planet for decades, and I think my current favourite island is St.Lucia. If you can spend the money, check out Anse Chastanet, or even Jade Mountain. They are a trip of a lifetime, and St Lucia is full of things to see and do if you want an active vacation--volcano, rainforest, reef diving, botanical walks in elfin canopy forests up the mountains, mountain biking, horseback riding, and more. Come home to exqusite art in your room, spa treatments, local music, and great food. These resorts are "unplugged" from TV and internet, so you can spend lots of time enjoying each other and relaxing. Renew your vows on the beach at sunset, and have a great time!
See my hubs:
"Yoga at a Honeymoon Hotel" http://hubpages.com/t/1ecba9
"Saint Lucia Chef Jonathan Dearden of Jade Mountain" http://hubpages.com/t/1ec26e