I learned that the 20km course follows a route that is only opened twice a year. It is really tough but also, because it is available so seldom, it is very crowded.
We did the 5 km course and it was long enough considering I carried my little guy at least one km. We did the walk with the four Domestic Blisses and I notice that not one of these photos has Mrs Bliss in it.
On the way to the start, from the bus, we saw a deer running in the dry riverbed. We didn't see many other animals but, thanks to the clear air, the scenery was sharp and the horizons distant. I am sure the adults had fun, but the walk was mostly about the kids, who had fun during these photos at least.