These are lodges that are not members and that I can't vouch for but they profess that they practive sustainable tourism.
Please let these hotels know you found them on Eco Tropical Resorts

Hotel El Rey Del Caribe The Hotel El Rey del Caribe is an oasis of tranquility in the center of downtown Cancun. The hotel's traditional colonial facade is cheerfully painted with a Mexican flair. Passing through the wrought iron gates , you enter the interior courtyard where you are surrounded by lush tropical gardens. We invite you to join us in our efforts to make an ecological concept a reality. We do our best to respect the environment. LOCATION: Yucatan, Mexico Hotel El Rey Del Caribe
Hotel Desconocido Read Reviews An enchanted paradise beckons those with an appreciation for nature and an affinity for the unique. Nestled on a wetland estuary between the Sierra Madre Mountains and the Pacific Ocean, Hotelito is located in one of the most important sea turtle and bird reserves in Mexico, 60 miles south of Puerto Vallarta. LOCATION: Cruz de Loreto, Jalisco, Mexico Hotel Desconocido
Papaya Playa We offer ecological accomodations that are in harmony with nature. Our rooms (cabanas/palapas) are built with natural materials, following the wisdom of the native people, with stucco walls and thatch roofs. Located in the Riviera Maya (near Tulum). Enjoy the incredible turquoise blue waters of the Mexican Caribbean, on the eastern shores of the state of Quintana Roo. LOCATION: (near)Tulum, Quintana Roo, Mexico Papaya Playa
Villas Ecotucan Spend your days surrounded by nature at Villas Ecotucan Ecological Resort located on the shores of the beautiful Laguna Bacalar, one of Mexico’s largest freshwater lakes. Stay in one of five comfortable and spacious stone cabins with thatch rooves surrounded by tropical gardens and reminiscent of a Mayan settlement offering guests a tranquil base for relaxing with nature. LOCATION: Bacalar, Quintana Roo, Mexico Villas Ecotucan
Las Canadas Read Reviews Las Cañadas is a private reserve of 756 acres with one of the few remaining cloud forests in the central region of the state of Veracruz in Mexico. It has been designed to share a different way to live, produce and travel. We receive eco-tourists two weekends per month. The groups are kept very small to guarantee that the visitor gains an excellent quality of experience and to cause a minimal impact on the eco-system of which we form part. LOCATION: Huatusco, Veracruz, Mexico Las Canadas
Hotel Las Palapas Read Reviews Hotel Las Palapas is a special place for nature lovers - not just because of our beautiful beach, but also because of the dense jungle vegetation on the land that the hotel was built on. Only 15% of our land has been used for construction. A large portion is covered by lush tropical gardens, and a full 50% of the grounds is completely untouched. That's why you see and hear many species of colorful birds, meet lizards quite often, and see plants that only grow in the jungle.Located in Playa Del Carmen, on the Pacific coast of Mexico. LOCATION: Playa Del Carmen, Quintana Roo, Mexico Hotel Las Palapas