This adventurous overnight trek in Gunung Leuser National Park is the most popular option to discover and experience the tropical rainforest of North Sumatra. We will start our activity at 9:00 am. During this two-day trek, you go into the jungle, with great chances of seeing 8 species of monkeys that are hiding in the Gunung Leuser National Park: the Sumatran Orangutan, the Long Tail Macaques, the Pig Tail Macaques, the Thomas Leaf Monkeys, the Silver Leaf Monkeys but also the rarer to see White-handed Gibbons, Siamangs and Slow Loris and other animal up-close in their natural habitat, hike to a campsite by a river, then swim, eat dinner, playing some game in your campsite. On the second day after enjoying your breakfast in the jungle, you will go deeper into the jungle to explore more about our flora and fauna, you will even enjoy some fun traditional rafting back to Bukit Lawang with a wonderfull jugle view.