I did "Ride the Rockies" a few years ago and had a blast. It was 7 days in June of riding between 50 and 100 mies per day. I went alone, which was the bad part, but I always had someone to ride with. I am thinking of going in 2007, and I thought, why not ask the 50+ers is they're interested in going. You have plenty of time to train for it... In February you need to log into their website and print out the application and send it in. It is done via lottery, so there are no guarantees, but you will know sometime in March if you are in. The route always does 2 or 3 mountain passes and you get to see a lot fo the Colorado landscape. They change the route every year, so if you've done it before, chances are you will be going through towns you didn't go through before.
On Labor day I am going to try something that will determine which bike gets taken to Colorado. I have a fixie, which I love to ride-- I have over 3300 miles on it this year-- I am going to Skyline Drive to do 62 miles (with over 7000 feet of climbing). Thirty one of them will be uphill. If I can do that with the fixie, that is the bike I plan to take to Colorado in june...otherwise, it's the multi-gear.
At any rate, I would enjoy meeting some of you there and riding along as well.