This place is no joke. You have to be wise. If your innervoice says stop and turn around, then you should stop and turn around and go home. People die here. Don't be stupid.
On that note you should be in shape to do this and start off very early in the morning and avoid it entirely in the summer unless you are in excellent shape and used to doing strenuous activities in the desert. But what do I know I'm just a paramedic.
If you accomplish this you have a smile on your face all day.