You can rent kayaks in Bukit Lawang for kayaking on the river. Trips further a field are also available. Colorfull weekly markets are held each Friday in the bus station at Gotong Royong, where buses from Medan drop and pick up passengers. If you are in town on a Friday, it’s worth a visit. The market runs from morning until around 4pm. If you arrive in the morning you will see workers from local rubber plantations bringing their rubber to be weighed and sold. By afternoon all the rubber will have been sold, and the workers and land owners paid, but the strong smell will remain!