Thanks all. I run 5+ miles at a 8:00/min pace 3-4 times a week. i try to spend as much time on the bike as possible but that's a challenge living close to downtown, or anywhere in Houston. I plan to supplement my usual regimen with some weights for the pack and will do Rice stadium stairs to get better suited. I used to work downtown and people would train by going up the building stairwells but thats verboten building management at my current office.
As for acclimatization, I plan to stay at the whitney portal or cottonwood two days before setting out.
One last question, if I am back to whitney portal by 2pm Sunday is it feasible to make a 7pm flight out of LAX or would that be cutting it too close?
Just a piece of advice, don't rush to get back anywhere. Life is short, enjoy the area it is beyond awesome. On top of that, you need to factor in the possibility of a bit of traffic which you could get to LA, ONT or Vegas.