Rainforest Alliance is a leading international conservation organization. Their mission is to protect ecosystems and the people and wildlife that live within them by implementing better business practices for biodiversity conservation and sustainability. They run and support numerous conservation projects, provide funding and commission research into rainforest conservation issues. They have recently produced a feasibility study and implementation plan for a global sustainable tourism stewardship council.
Their education sections contain lesson plans, downloadable resources (many of which are in English, Spanish and Portuguese), activities and facts and figures sheets which could be useful for developing educational and interpretation displays. They also have a monthly email newsletter which provides news of new resources and case studies of education work based on learning about rainforests.