Take a couple of the best small flashlights you can find, they are great for night time canoe trips. Lots of caiman/snakes/bats. But don't leave the lights on for too long, they attract wasps...ask me how I know.
Also, be sure to wear close-toed shoes when you go piranha fishing, if they wiggle off the hook and drop to the deck of the canoe, well...you see what I mean.
Here are a couple of fotos; sunset, a hoatxin, and dinner.
Have a great trip and pls share some fotos when you get back.