No need for an oxygen cannister - just drink lots of water, lay off the caffeine and alcohol
(it's twice as potent at high altitude), and take it easy the first day or 2.
A half dose of sudafed w/ breakfast, a facial moisturizer, a chapstick, and a glass of water on the nightstand are all you typically need.
And remember your sunscreen (esp on your ears) - you're a mile or 2 closer to the sun!
If you want to go hiking in the nearby mountains, this book is the locals' bible:
http://www.alpenrosepress.com/new_summit_hiker_and_ski_touring.htm