Sydney is now home to the world’s fastest zipline at TreeTop Adventure Park in Western Sydney Parklands. The TreeTop Crazy Rider Xpress reaches speeds of up to 50 kilometres per hour, making it the world’s fastest zipline roller coaster of its kind. Riders can expect to duck and swerve trees while doing a few 360-degree flips. Check out this exhilarating roller coaster for yourself at TreeTop Adventure Park. 749 Elizabeth Drive, Abbotsbury.