Venture far beyond the mangroves on a 15-mile boat trip to the mouth of Monkey River, home to birds, crocodiles, iguanas, and, of course, elusive howler monkeys. After a relaxing ride down the river spotting wildlife, your local guide will lead you through the rainforest, where you’ll hear the signature howl of the river’s namesake. If you think you’ve never heard a howler monkey before, think again—their distinctly Jurassic calls were used to create the vicious roars of a certain movie franchise.