19 Out of This World Hiking Trails in Indonesia with Amazing Views May 23, 2017 by Stassi Reid View All On 1 Page 3. Mount Agung, Bali Make sure to bring comfortable shoes and plenty of water. The hike up Mount Agung, the tallest mountain in Bali, will take you about six hours in total. But it’s worth each and every step just to take in this sight! flickr.com 3 of 19PreviousNext