One of my scariest moments was getting lost in the jungle. I was staying in a lodge near Puerto Maldonado. I decided to take an evening walk. I consider I have a very good sense of direction, but as the evening was overcast, I soon lost my way. It took me over an hour to get back to the lodge. Fortunately my travelling companion missed me, and the lodge had a bull-horn and by calling my name, I was able to find my way back. It reminded me of the terrifying Peruvian movie "
En la selva no hay estrellas", a scary film about a criminal who wanders days and days in the jungle eventually arriving half straved and mad back where he started.
I guess it won't be so bad if you keep to the rivers. At least there are only two directions you can take, upstream or downstream.
Let us know if your drunken plan maps out.