ShoreTrips says...

Depart by local Riverboat from the Floating Docks, the world's largest floating port that was specially devised to avoid flooding.

Cross the Rio Negro by riverboat into Lake January, an ecological Park situated between the two rivers. Board canoes with outboard motors and drive through the dark and exciting jungle. At night is when the jungle comes alive. Watch the game of shadows and listen to the mysterious sounds, as your guide watches for alligators. When he finds one, he then will jump into the water and catch it with his bare hands. Take this unique opportunity get a close look and take some pictures, before it is released back into the river.