Was in Colorado/California 2 weeks ago on the bike and it was pretty amazing. Never been to the gap, hope to do it sometime this summer. I cant imagine anything in North America can stop Colorado/California both scenery and fun factor wise...
California riding: http://www.youtube.com/watch?v=fbsNqhhiRHI ...And this is only half of the way down the mountain...
That sure looks like fun, but the road surface doesn't seem to compare with:
http://www.youtube.com/watch?v=OkjW27h8wE8 (starts slow, gets progressively faster).