Go to the desert in winter
Maybe you are as lucky as I was in June to see some rain and then all the minerals coming out of the Atacamas rich ground colouring the desert. Also it was great to see the snow line coming down so close to the village as you can see on the picture. Better you bring a good jacket, though, as this desert in this time can also be quite chilly during the day (San Pedro is at 2200 m above sea level)

Road on Lascar
Jesus in the Chiu Chiu Church
Lacar volcano covered by snowstorm clouds
Swimming in the Andes