If you’re looking for an alternative route to SPDA, at the north side of Baquedeno, head SE on B-385 and follow it all the way east to the south edge of the Salar de Atacama. Cross the salar - the roads are well established and nowhere near as freaky as salar Uyuni. B385 is a salt road and is a very easy surface to ride. On the east side of the salar is a nice ribbon of asphalt that skirts the volcanos. Some lagunas with flamingos. Really pretty. Definitely a prettier ride than the ride to Calama. My 2 cents.