Hey man. Congrats on the forth coming move. I am from Denver originally and moved away about 20 years ago, but go back 4 or 5 times a year to see family and hang out. LOVE THE PLACE and will be back someday soon.
As for biking, I am a runner and used to drive up to Boulder on the weekends and run in the Boulder Canyon. It is beautiful and challenging. There are a lot of bikers up there also. In Denver, I use to run along the Platte River. It is not much for bikers, but there are some along there. It is a little too crowded for bikes.
I hope you enjoy Denver. I will be there the first week in July. Maybe I will see you out on the road?