Mule trekking is synonymous with the Atlas Mountains but a few myths need dispelling. Mule trekking is generally trekking with mules rather trekking on mules. It is perfectly possible to have a mule for each member of the party and go on a riding trek as you would a pony trek, but it isn't really the point and indeed is considered a bit excessive by the locals... The mules are there mainly to carry your bags (or children!) and clothes or tents if you are trekking over-night. They are certainly very useful if you want to rest your legs but the terrain is often uneven and it is not comfortable to ride for long periods. In fact, on a daytrip, unless there are children in the party, we recommend you dispense with mules altogether.
So what is the point? The reason to go up to the mountains is to see a completely different side of Morocco - it is so close yet completely different to Marrakech. There is a friendly, more relaxed atmosphere and watching the people go about their daily lives is fascinating.