What could you compare to riding a dirt bike or ATV over the 300 million square miles of the Sahara desert?
If riding motorized vehicles isn't your cup of tea, you could do something else too. There are plenty of rocks and hills in the desert that you could rock climb or hike through.
You can also see some really cool animals and plants that you wouldn't see very much elsewhere--almost like a zoo...but free!
You could use all the large amounts of sand to build a sand castle. Or two. Or three. Or however many you would like to build! There is plenty of sand to use!