The hike to the top of Mount Sunday is awesome for beginners as its mostly flat and has a great view from the top. The walk is about 45mins from the car park, however you have to drive for about an hour and a half off road on gravel. This will definitely lead to a lot of dents in your car. We also had to park the car about 45minutes walk away from the car park as the road was flooded, but we had fun walking and made some friends who were doing the same walk.
The only real trouble we had with the track was the last 5minutes up the steepest part of the hill which was completely shaded and the grass was frozen and we both slipped over.
Also, for people who are fans of Lord of the Rings, it is the filming location for the scenes set in Edoras.