Originally Posted by
palesaint
Just pace yourself, drink and eat often. You will be fine.
This, but eat/drink less than you did in that other thread unless you enjoy puking.
I've lived close to sea level practically my whole life. Elevation is no big deal. Your HR will run higher than normal, but you'll automatically ramp back your effort as you run out of air which has the nice side effect of saving your legs.
Unless you're racing, there's no particular reason to train.