St. Lucia
Why Go: This Caribbean isle has a lush landscape that includes the twin Pitons and plenty of rain forest to explore.
What to Do: Hike to one of the island's many waterfalls, then cool off together in the natural pools at the bottom.
Where to Stay: Jade Mountain has open-air rooms with their own infinity swim-up pools and views of the sea, JadeMountain.com.
Find the best travel agents for honeymoons >
Photo: Thinkstock