I'll be returning to Ecuador again this winter. This time, we'll be travelling down the Napo river aboard a river boat. There will be day hikes into the jungle. As this is not primarily a photo trip, I'll be travelling light (photographically) and only plan to bring a 35mm SLR and a few lenses at most. I'm wondering what to expect. There just isn't much written about the jungle from a photographer's point of view. Anybody have any suggestions or stories to share?