Nature is what mostly features Borneo, with its unique ecosystems and the hundreds of animal species and endemic plants. If you want to deepen this particular aspect of the island, but you also want to add more adrenalin to your experience, we suggest this excursion: you will visit the Orangutans Rehabilitation Centre and go kayaking up the river; you will go finding trunk monkeys, elephants and hornbills, and you will  go from an island to another on a zipline; you will visit the rock necropolis of Kadazandusum and go finding carnivorous plants.