Switching from land to boat, this three-hour 14km river-trip runs through the densely forested northwestern part of the peninsula. You'll have to dodge branches at some points, while at others the river opens out into a wide delta-like estuary. Birdlife is abundant and you may also see turtles and crocodiles. You need independent transport (try Cubacar) to cover the 90km to the start point.

Excursions can be booked through the National Park Office.