Destination: Aspen Skiing Company, Colorado
Environmental Initiatives: 70
Local Contributions: 68
Guest Experience: 60
Overall Score: 66
Skiing doesn't have the greenest reputation: Clear-cut trails break up wildlife habitats, and snowmaking drains water from already-low streams. But ASC leaves patches of trees within the runs on its four ski mountains so that animals can cross slopes, uses purpose-built reservoirs to supply snowmaking needs, runs its Sno-Cats on biodiesel, and fashions jumps out of dirt. At the company's Snowmass site, it cut the Long Shot run in an S-curve to prevent erosion and installed the state's first wind-powered chair lift. ASC donates one percent of all profits—$200,000 annually—to various charities, from prenatal counseling to wildlife protection. And at Aspen Mountain's Little Nell hotel, $2 of each guest's bill goes to the Aspen Valley Land Trust—comprising half of the trust's annual contributions (800-525-6200; aspensnowmass.com; lift tickets, $74).

LodgeS/ResortS: El Nido Resorts, Philippines
Environmental Initiatives: 74
Local Contributions: 76
Guest Experience: 63
Overall Score: 71
Sister properties on Miniloc and Lagen islands, these two resorts have taken a leading role in protecting the area's greatest assets—its coral reef and marine and forest habitats—by helping to secure governmental protection, collaborating on scientific studies, and planning low-impact development and activities. Every staff member, from gardener to dive guide, has taken classes in ecology, geology, and history. Miniloc, which is in a cove bordered by limestone cliffs, attracts families with kayaking in two lagoons and snorkeling among manta rays, clown fish, and dugongs along natural and ceramic reefs (the latter rehabilitate coral damaged by dynamite fishing). Jungle-fringed Lagen has a more serene, laid-back feel and a spa. Both resorts offer mangrove tours, hiking, and private-island picnics (63-2-894-5644; elnidoresorts.com; doubles, $224–$285, all-inclusive).

Tour Operator: G.A.P. Adventures
Environmental Initiatives: 68
Local Contributions: 71
Guest Experience: 69
Overall Score: 69
After running this successful travel company for 11 years, Bruce Poon Tip wanted to give back to the communities his clients visited. The result: the Planeterra Foundation, which supports grass-roots projects worldwide. Since G.A.P. pays Planeterra's administrative costs, every penny donated—plus a matching gift from the tour operator—helps people in need: Ecuadorian schoolchildren, Honduran women seeking small-business loans, and survivors of the Asian tsunami, among others. Many G.A.P. itineraries include visits to the foundation's beneficiaries, with travel styles that cater to everyone from families to gourmets to serious adventurers. Clients on an Ecuadorian trip overnight in a Quichua home, visit a women's weaving cooperative, and go climbing in the Andes (800-708-7761; gapadventures.com; 18-day Ecuador Experience trip, $645 per person).