Devoid of Life and Interest...

Personally I was yawning the entire time on the tour. Yes, it is interesting but only for the first hour. I would suggest going on your own if possible (you can hire bikes but it is a wee way out of town). The sunset wasn't worth it either, it also gets very cold. The rock formations were interesting, along with the salt deposits, however if you have travelled through Bolivia or through the deserts in Peru you may be bored...