For a bit of off topic comic relief, I did this with a large group of folks in a place we really should have known better. My now-wife and I spent a couple of years in Chile teaching (her teaching first graders and being a productive member of society, me teaching businessmen and being much less so). Shortly after moving to the north of the country we took a big teacher trip to San Pedro de Atacama, in the middle of the desert. Someone thought it would be a great idea to all rent bicycles and sandboards and bike out to some dunes to go sandboarding. Only a few of us were cyclists, so it was a bit sketchy to begin with, but we barely brought any water, just a few litres of water for like 20 people, for a good half day trip.
To a place called Valle de la Muerte.
Everything was fine in the end because my wife and I raced back into town, fetched colleagues with the trucks, bought a boatload of water, and raced back to escort people back to the highway for pickup.
Anyway, here's a photo of some not very well hydrated cyclists in the valley, and to vaguely keep it on topic some flamingos from the salt flats in the area.