Stargazing tours are the top activities in this region. All stars and milkyway is in front of you. Get ready to take spectacular photos.
Keep in mind that this is a weather dependant activity. Clouds and full moon mean visibility problem. During the time of the full moon it is not possible to see the stars easily and that is why they do not conduct tours during that time. Also due to cloudy weather, tours may be cancelled but this region is famous with its clear skies.
I strongly recommend the stargazing tour in this website ( http://www.spaceobs.com/en/Services/Star-Tours ). Tour is about 20000 Chilean Pesos (2015 price) around 30 USD. Ask whether English, French or Spanish speaking tour will be organized that night.
As nights are cold in desert, don’t forget to bring some warm clothes.