You'll get tired faster, too, so plan on pacing yourself. And you should enjoy some CO brews while you're up. At 9k ft it will only take you a few microbrews to buzz pretty hard.
When I was in Cuzco, Peru (~11k) they gave us coca tea when we got off the plane and kept feeding it to us for a few hours. So, if you can get ahold of some lady C that might help you out :P
I hope in the future Americans are thought of as a warlike, vicious people, because I bet a lot of high schools would pick "Americans" as their mascot. -Jack Handy