If you want a comfortable, well organized trip with a considerate and well-informed guide you couldn't do better than Arenas.
Hamad, our driver and guide, made the trip for us and the children. He was patient, well-informed and funny - and he drove with care and consideration.
The tourist routes out of Marrakech are well-worn thoroughfares, so don't expect solitude. But if you want to relax and not stress about the logistics - this is the way to go.