There are many places where you can go quad biking starting from 1 hour to a full day however don’t expect the desert in Marrakech. The best you can hope for is rough terrain, river and scenic berber villages however if you willing to travel 600 Km in the direction to Merzouga South of Marrakech you will find a true desert.
Let’s stay in Marrakech!!! – Even not the same there’s a fantastic quad bike track in the Palmeraie, 15 mins by taxi from the medina. It’s run by Nomade Quad. They organizes hiking tours, camel raids and Quad biking.