Leave it to Al to come up with the ridiculous altitude sickness excuse. Denver is only around 5,000 feet above sea level. How many people visiting Denver had altitude sickness who weren't skiing or hiking at higher elevations? According to everything I've read extremely sensitive, otherwise healthy people, might have a problem above 6,500 feet. it would be interesting to hear from the doctors that specialize in altitude sickness to hear what they think of Al's theory. I'd be curious to know how many people are having this problem at 5,000 feet.