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Check into one of the Caribbean's posh eco-resorts and get all the outdoor adventure you want-in luxurious style.

Travelers have long been impressed by the beauty of the Caribbean islands, from the rain forests and cloud-shrouded volcanic peaks to the abundance of wildlife, both on land and in the sea. For those who crave the great outdoors, the islands are a living treasure.

And now you don't have to rough it to stay in the wilderness. A growing number of upscale eco-lodges throughout the region offer true comfort and honeymoon-worthy service. All of them employ various types of alternative energy and recycled materials, but you'll also get luxury-hotel perks: Several of these tony lodges offer gourmet room service, high-thread-count sheets and posh bath products. They have varying degrees of modern technology—some have wireless Internet access; others don't even have phones. But all offer an immersion in their natural surroundings that you can't achieve at the average beach resort. Here, four incredible eco-lodges on four wildly different islands. They range from most rugged to most posh—and you'll know right away which one is best for your honeymoon escape.

Campfire Girls 'n' Guys

Located on low-key St. John in the U.S. Virgin Islands, the 153-room Maho Bay resort was one of the first experiments in Caribbean eco-tourism in 1976. Today, it uses eco-sensitive technology, including rainwater-recycling systems and solar-heated showers. More important, it remains one of the most fun options on the island, with yoga classes and snorkeling excursions in the north shore's pretty harbors. Maho also provides a rare opportunity to stay on national parkland—in this case, the Virgin Islands National Park, one of the Caribbean's most pristine nature preserves.

Maho Bay is made up of four "camps." Two have open-air tents, and the other two are enclosed buildings with actual guest rooms. It's no surprise that the two buildings—the 12-room Harmony Studios and nine-room Estate Concordia Studios—have the most luxurious accommodations. Don't call this camping: You'll find private baths, spacious bedrooms with queen- or king-size beds, living rooms decorated with wicker furniture, private decks and elaborate kitchens. How do you choose? Harmony Studios is in the park, while Estate Concordia Studios is just outside and has a swimming pool. Either way, these guest rooms are truly "unplugged"—there's no modern technology, such as TVs, DVD players or radios. (You'll have to use the house pay phone if you want to call home and, say, tell your parents how much fun you're having on your trip.)

Stay at any of the four camps, and the park becomes your playground. Twenty-one trails wind across wooded hillsides alive with tree frogs and hummingbirds while, underwater, markers lead snorkelers past tropical fish. Guests can also take part in the resort's numerous outdoor classes (including sailing, kayaking and windsurfing) and indoor activities (including arts and crafts, such as ceramics, glassblowing and papermaking). The watercolor class is a great opportunity to take your beautiful surroundings home with you (Maho Bay, St. John; doubles start at $135 per couple per night at Estate Concordia Studios and $220 per couple per night at Harmony Studios; 800-392-9004; maho.org).

Animal Magnetism

Located on a pristine peninsula in the southern part of Belize, surrounded by millions of acres of coral reef and rain forest, the 42-room Jaguar Reef Lodge is framed by stunning white-sand beaches, turquoise bays and coconut palms. Sure, the setting is lovely, but what really sets Jaguar Reef apart from other beach resorts is easy access to the country's awesome barrier reef and the jaguar-filled jungle of mainland Belize.

Ten miles of golden sand—and seawater that averages 80ºF—are just footsteps away from the resort. Turtles, dolphins, barracuda and rays thrive near the reef, where visibility can reach 180 feet. After a quiet day of fishing, shift into high adventure on an Indiana Jones-type excursion into the Belize interior, where you can go rappelling or explore Maya pyramids.

Back at the resort, sink into a beachfront hammock (woven locally, of course) and relax before dinner. Menus are surprisingly sophisticated for a resort located this far into the jungle, with dinners including Continental treats such as filet mignon topped with a proper béarnaise sauce and grilled lobster served with creamy coconut rice.

When it's time to retire to your room, you'll be glad that the whitewashed cabanas and suites are air-conditioned and are protected from bugs by organic insecticides. Guest rooms don't have TVs or telephones, but the resort has wireless high-speed Internet access, so civilization is never too far away. You'd never know it to look at the place, though: The exteriors of the buildings are made from natural, local materials and topped with thatched roofs, and the interiors are decorated with Mexican tiles, colorful textiles and indigenous artwork—a little culture in the middle of the rain forest (Hopkins Village, Belize; doubles start at $175 per couple per night, with a three-night minimum; 800-289-5756; jaguarreef.com).

Nature Wins

The British Virgin Islands is one of those rare Caribbean destinations where nature seems to trump civilization. That's especially true at the 16-room Guana Island resort, an all-inclusive eco-lodge located on its own private island off the north coast of Tortola. Although only a few minutes by motor boat from BVI's international airport, the resort feels truly remote. That's no surprise, considering the fact that it sits on 850 acres of pristine forest, with space for only 36 guests.

As a result, chances are good that you'll be the only people on whichever beach you choose, and that you won't see another couple on your hike regardless of the trail you pick. It also means there's nobody around to disturb the animals: The entire island is a wildlife sanctuary, home to rare and endangered species like the masked booby and the Caribbean flamingo, as well as rare orchids. Life flourishes in the water around Guana, where the shallow bays prove perfect for scuba diving and snorkeling. Back on shore, crawl through caves or perfect your allover tan at secluded Bigelow Beach.

Guana may feel remote—and it's true that there's no electricity in the guest rooms. But it's also the only wildlife sanctuary in the world with a daily cocktail hour and superb cuisine. At the end of a day of close encounters of the natural kind, retire to one of the resort's stylish stone cottages. The interiors are filled with simple yet elegant Caribbean rattan furniture; plantation shutters let in the breezes and terraces offer gorgeous ocean views. (The cottages also have wireless high-speed Internet access, in case you can't relax without reading your hometown paper before your morning coffee.)

After sipping aperitifs on the Sunset Terrace, dine alfresco by candlelight at a table for two set with china and crystal. The fresh seafood is divine, and is served with fruit and vegetables grown on the island, as well as freshly baked bread. In the end, you may decide that you came for the nature but stayed for the nurturing (Guana Island; doubles start at $650 per couple per night including meals, wine, transfers and some activities; 800-544-8262; guana.com).

Rasta Love

Located in the legendary Blue Mountains, the 12-room Strawberry Hill resort is like nowhere else in Jamaica. It's a highland retreat rather than a beach property, an intimate getaway rather than a bustling all-inclusive, and it's low-key rather than an endless party.

Once the family home of a reggae-music mogul, the resort started life as a strawberry farm; much of the food for its restaurant is harvested from small farms in the surrounding hills. The British colonial-style cottages have been transformed into luxury bungalows with locally made furnishings (including muslin-draped four-poster mahogany beds), louvered windows and balconies that seem to float among the clouds. Bathrooms have terra-cotta tile floors and old-fashioned soaking tubs. Guest rooms also have modern conveniences, such as TVs and CD players with incredible music systems. There's no air-conditioning, but the mountain breezes are a treat. Plus, it's a pleasure to keep your windows open: By day, hummingbirds flit outside, and after dark the lights of Kingston twinkle 3,000 feet below.

You can easily while away your days around the infinity pool, exploring the resort's botanical gardens or getting massaged inside the Aveda Concept Spa, where therapists use eco-friendly products like Blue Mountain coffee extract and beeswax candles infused with Jamaican ginger.

But since the resort is located in the wild Jamaican highlands (which most visitors to the island never see), nature beckons. Holywell National Park is right up the road, as is Alex Twyman's Old Tavern Coffee Estate, where some of the world's best beans for java are grown and roasted. Looking for more of an adventure? Hire a guide and trek to the summit of Blue Mountain, or go for a bike ride.

Guests gather each night in the resort's wood-paneled bar, where the reggae, the crackling fire in the fireplace and the legendary rum punch take the edge off the evening chill.

Meals are served outdoors, on wraparound wooden terraces, and dinner is a candlelit affair that includes Jamaican delights such as spicy jerk pork, mackerel rundown (a fresh fish dish cooked with coconut milk and spices), tangy callaloo soup and saltfish with ackee (a stir-fry that includes vegetables and fruit, and is Jamaica's national dish)

After-dinner entertainment is up to you—but the romantic four-poster beds are most inviting (Irish Town, St. Andrew, Jamaica; doubles start at $315 per couple per night; 800-688-7678; islandoutpost.com).