Stranger in the Forest
This is a fascinating book about an American who learns standard Indonesian and barters his way from Sarawak to Sabah through the rainforest. He trades shotgun shells and tobacco for tribal guides. He falls frequently, gets bitten by leeches and ends up having to rest his battered feet after 3-4 months in the Jungle. This has been a primer for me. I will visit Sabah for a month in few days. This is a great adventure by a crazy guy who really immerses himself in the culture.