Tabacón Grand Spa Thermal Resort, Costa Rica

Named by Condé Nast as the "Most Excellent Spa Hotel" of Mexico and Central America in 2011, Tabacón is consistently recognized as one of the best spas in the world. This five-star hotel is located in northern Costa Rica, at the foot of the majestic Arenal volcano and in the heart of the rainforest. Enjoy your spa treatments in open air bungalows surrounded by pools and waterfalls formed by natural hot springs from the volcano. Tabacón is carbon neutral and certified by the Costa Rican Tourism Institute's Certification for Sustainable Tourism (CST) program, Sustainable Travel International's (STI) Sustainable Tourism Education Program, and the Leading Hotels of the World's Luxury Eco Certification Standards (LECS).

Couples Tower Isle, Jamaica

Couples Tower Isle is an adults-only resort in Jamaica, honored as the best hotel spa in the Caribbean by Travel+Leisure magazine and one of the top Caribbean all-inclusive resorts by Trip Advisor's Travelers' Choice Awards. The resort underwent a major renovation in 2009, reopening with a total of 226 rooms, a dive pool, and ten spa treatment rooms. The colorful and minimalist pastel décor, three swimming pools, Jacuzzis, and a private island for au naturel sunbathing make Couples Tower Isle a paradise of relaxation. As the name suggests, all the services and activities are tailored for couples. Couples Tower Isle has achieved a "Gold" level certification from EarthCheck.

Lodge at Chaa Creek & The Macal River Camp, Belize

Chaa Creek is located on a huge 365-acre (148-hectare) private nature reserve, nestled in the rainforest in the foothills of the misty Maya Mountains. Choose from 23 eco-chic cottages, villas, and suites at Chaa Creek or, for those seeking more rustic accommodations, there are also 10 wooden cabins near the Macal River. Chaa Creek's spa uses natural, herb-based treatments such as mineral rich mud treatments, herbal wraps, and locally-sourced botanicals. Travel + Leisure magazine named it as one of the Top Hotel Spas in Latin America in 2011. Chaa Creek is certified as sustainable by Green Globe International.

Inkaterra Machu Picchu Pueblo Hotel, Peru

Nestled in 12 acres of private gardens at the foot of the mountains that surround the ancient citadel of Machu Picchu, Inkaterra offers an atmosphere of refinement and luxury within a rustic Andean village. Stay in one of their elegant white casitas or more opulent villas, designed with inspiration from traditional Andean culture. The UNU Spa at Inkaterra uses local botanical extracts and incorporates elements of traditional Andean mysticism for a unique experience. Inkaterra is Rainforest Alliance Verified.

Luna Runtun, the Adventure SPA, Ecuador

Situated on a 63-acre (25.5-hectare) property within Sangay National Park, Luna Runtun is a refreshing change of pace from the sleek, modern spa resorts you often find in the Caribbean. This "adventure" spa resort combines ecotourism activities and beautiful mountain landscapes with a unique "Volcanic SPA." The spa uses fresh plants and fruits, employed for their natural healing properties and grown in the hotel's 300-acre (121-hectare) garden, as well as mineral water and ashes from the nearby and very active Tungurahua volcano. Guests can enjoy watching Tungurahua shower the skies with spectacular shows of fire and lava from the safety of the spa. Luna Runtun is certified by Smart Voyager and has created the Tungurahua Volcano Foundation, which oversees a number of environmental and community projects.