A place you should go to is the Tatacoa Desert itself. There, you can walk around the dry valleys and look at the beautiful red and gray formations. 

At night, visitors can look up at the sky and enjoy the stars, since the desert can offer very clear views of the night sky.

Visitors:  can go hiking through the valleys. If you walk during the morning, you will avoid the strongest heat, they also should visit the astronomical observatories. If the sky is clear, you can see many stars and planets, in addition can take photos of the red and gray landscapes. If you bring a camera, you will capture amazing views of the desert.