As a reply to kievalina: One thing the good folks here who live in the mountains left out.

Aspirin or other pain reliever will be needed for the first couple of days to help with the headache you'll be getting from altitude "sickness". Just be sure to hydrate. If you feel thirsty in the mountains you're already way to dehydrated.

Also, make sure the sunscreen you take has a moisturizing element as well. It's very dry at altitude, and will seem great compared to Detroit, but will dry your skin and lips out quickly. Also, you should take saline solution for your nose. Doesn't need to be a great big bottle, but at least 6 oz.