I attended this activity at Catanger Farm as part of a large family group for a 70th Birthday. Mary and David (and their dogs) made us all feel very welcome and explained all about the history of the llama and alpaca before we went to meet them. It was very hot so we didn't need the wellies that they had available although a couple of sections of the walk were still slightly squidgy, so I'd recommend wearing suitable stout shoes. The walk took place on leafy trails, along open fields and down woodland tracks giving a really good variety of environments.
Most of the time the llamas walked along quite sedately but they are quite strong and can be fairly spirited, so you have to be quite firm with them when they keep trying to eat leaves, bushes, grass etc. They have their own personalities, with some liking to be near or at the front, whilst others prefer to be nearer the back but not liking the group to be out of sight. My llama (Fudge) seemed to particularly like oak leaves and always tried to make a beeline for them once he spotted a tree.
It was really nice to be 'in charge' of such a large creature and so close to them for the whole of the walk. They are not especially affectionate creatures but don't mind being stroked on the neck, which is incredibly soft and nice to do occasionally. :)
Mary knowledgeably answered all our many questions during the walk and we all learned a great deal about these wonderful creatures. I would say that it is very important to keep the little ones away from the back of the llamas at all times as they sometimes step backwards without warning, can't see where they are going and could accidentally tread on a youngster.
All in all this was a very different but thoroughly enjoyable experience, which I would recommend to people of all ages.