Have you read Kane's Running the Amazon? Here's another good one. It even won the Bay Area Book Reviewers Assoc Award in 1995. Kane travels to Ecuador to live for a while with the Huaorani tribal people as their Stone Age culture bumps against the 20th Century. The Huaorani eventually befriended Kane, but at the beginning, it was just as likely that they might murder him, as they had fairly recently killed a missionary and several others they considered enemies. Something about Kane made them feel comfortable - lucky for him. Kane intersperses magical vignettes of tribal life with historical and sociological information in a way that makes his book imminently readable by ordinary readers like me as well as my scholars and sociologists. It's a good one.