The places where the sand forms large dunes are called “erg”, and in Morocco there are only two: Erg Chebbi and Erg Chigaga. These are the landscapes most sought after by travelers, but also the furthest from the main cities of Morocco, so it takes several days to visit them, but they are well worth knowing!
The best option is to go with a private driver, since you will be traveling in an SUV that can get on tracks less traveled than the main road. This will allow you to get to know places that the majority do not reach, meet nomads or overcome any obstacle without difficulty.
Traveling accompanied by someone local is always important since they will tell you what you want about their habits and culture, in addition to taking you to the most interesting places and seeing the sites first-hand by a local.