Hike - Walk on the edge of desert dunes
If you have a good physics you can go into the sand dunes, but never go further than you can see the end of dunes (the village) otherwise you can get in trouble and get lost. If you want to go further away, you bring a guide with you or at least a compass so you can find your way back. Also bring plenty of water with you, wear a hat, sunscreen, sunglasses, long-sleeved shirt and preferably long pants. Avoid shorts. Wear shoes that are comfortable for you.
Listen to advice from the local people, what they say about the weather, or other advices that protects you in the desert. The weather can change into a sudden sandstorm.