A fair bit of the sightseeing was by means of a boat tour around an oxbow lake. Saw lots of birds, a few different types of monkey, some caiman, turtles, fish, etc.
We also went on a bunch of walks through the jungle. It was secondary growth jungle, so not quite as overwhelmingly jungly as I had imagined, but still very cool. Saw more monkeys, a macaw palm lick (see photo below) big trees, learned about different medicinal plants, ate some brazil nuts, and saw a tarantula on a night hike. Tarantulas are really big. Also howler monkeys are really loud. Then we took the same 18 hour bus ride back to Cuzco.