Later this year I'm going to Amazon rainforest in northern Brazil where I'm planning to stay for few days with an indigenous community by the Urubu river. It's not really an organized tour, my friend who is in touch with the group know will contact me with them, I'll pay for some tours to the forest with their guide and spend few days with the community.
They obviously are well in touch with civilization, they are descendants of the Wapishana people, mainly populated in the Rainforest of Guyana but also dispersed in Roraima and Amazonas.
Is there anything I should be aware of when staying with them to not seem as an obnoxious tourist and make the visit more pleasant?