You'll have to sit down and catch your breath when trying
to choose what to do first on your visit to Colorado. Not
just because of the high altitude, although you might take
that into consideration when making some of your choices,
but from the multitude of local sites and attractions to
enjoy. You'd be hard pressed to find another place in the
country where there's more to do and see...all year 'round..
Source: http://www.colorado.com/activities/default.asp?t=1