I took my wife and kids on a Colorado vacation back in 1995. One of the things that I did was take the rental car up Mt Evans road, which I believe is the highest road in the US. I made the trip up alone because my wife was too scared to try it.
I remember it being very beautiful. I was up there in July. Their were frozen ponds and icy areas with snow here and there. The most memorable thing for me was as I approached the top of the mountain, I came across a bunch of rocky moutain goats running all over the place. They had long fluffy white hair with horns. I'll never forget how special that was.
Driving up to the top, you can look to the east and see the flat plains, and mountain peaks everywhere else.
Be extra careful on a bike. I totally recommend making the trip.
Take care, Eric