We've combed the world (and double-checked eco credentials) to find accommodations that are your shade of green, whether your tastes tend toward the laid-back lodge or the lavish all-inclusive

BEACH

Hotel Eco Paraíso Xixim, Yucatán, Mexico
What Makes It Great
Each of the 15 thatched-roof cabanas (complete with full baths) has a veranda with Gulf of Mexico views.
What Makes It Green
Hidden on the Yucatán Peninsula's west coast, the hotel covers one percent of its 62-acre grounds. Biological filters recycle water, solar energy heats the pool (52-988-916-2100; ecoparaiso.com; doubles, $180).

Mauna Lani Resort, Big Island, Hawaii
What Makes It Great
The Kohala Coast resort has three miles of white sand beaches, a spa, and two championship golf courses.
What Makes It Green
The resort generates more solar electricity than any other resort in the world and raises green sea turtles (800-367-2323; maunalani.com; doubles, $355–$835).

Al Natural, Bastimentos Island, Panama
What Makes It Great
Bordering a marine park, the resort features secluded beaches.
What Makes It Green
The thatched-roof cabanas have solar power and rainwater collection systems (507-757-9004; bocas.com/alnatura.htm; doubles, $210–$290).

Banyan Tree Seychelles, Mahé Island, Seychelles
What Makes It Great
The resort spares no luxury in its pool villas with Indian Ocean views.
What Makes It Green
In addition to following Banyan Tree's environmental policies, the hotel matches guests' donations to its local environmental fund (248-383-500; banyantree.com; villas, $1,512–$2,860 for seven nights).

NATURE/ADVENTURE

Adrère Amellal Oasis, Siwa, Egypt
What Makes It Great
Travelers find traditional Berber comforts and a spa at this electricity-free Saharan oasis on a salt lake.
What Makes It Green
The hotel promotes environmentally sensitive development in the area and works to strengthen local Berber cultural heritage (20-2-2736-7879; adrereamellal.net; doubles, $448, including meals).

Seven Spirit Bay Wilderness Lodge, Northern Territory, Australia
What Makes It Great
The only thing separating this secluded lodge's 23 cabanas from its tropical national park setting are shutters that let the sea breezes in.
What Makes It Green
The lodge's stilted construction and detached baths maximize habitat conservation (61-08-8979-0281; sevenspiritbay.com.au; doubles, $1,265 for two nights).