Amerika Venture
Biosphere Expeditions
Bird Treks
Cosmopolitan Adventure Tours
EcoQuest Travel, Inc.
Eco Voyager
Exodus Travel
field guides
Gecko's Adventures
Geographic Expeditions
Guerba World Travel
INTRAV / Clipper Cruise Lines
kumuka
La Ruta Moskitia
Latin American Escapes
Mesoamerica Travel S.A.
Mountain Travel Sobek
Solimar Marketing & Travel
Terra Incognita ECOTOURS, Inc.
Valle Travel Service, Inc.
Worldwide Ecolodges
attractions
Utila Centre for Marine Ecology
lodging
Humuya Inn
The Lodge at Pico Bonito

ALSO: ADVENTURE, VOLUNTEER, MEDICAL and SPA TOURISM GUIDES