Of course, visiting just one place, regardless of its popularity, will only ever furnish you with a glimpse into the broader cultural and natural fabric of a region. So be sure to tour Sumatra's other cities, attractions and landscapes. If you're keen to explore more of the region, you'll find Berastagi, 25 miles (40 kilometers) to the northeast, and Parapat 60 miles (97 kilometers) to the north.
Medan, is another good spot to explore. It is 8 miles (13 kilometers) from Petumbak and offers a great selection of attractions, including Sun Plaza, Medan Great Mosque and Gunung Leuser National Park. Shri Mariaman, University of North Sumatera and Vihara Borobudur are just a handful of the other attractions in Medan.
If you have great weather, take the time to experience Sumatra's open-air markets. For a look into the spiritual side of Petumbak, why not spend a little time at the region's mosques.
De-stress like the locals in this area. Go bird watching and wildlife watching while you are here. Tap into the wisdom of the locals and take one of the guided nature walks and wildlife spotting tours.
There's an old saying that goes: it is far better to see a place once than to hear about it a thousand times. With its magnificent beauty Sumatra will not disappoint.