As a cyclist, there is a lot offered in Boulder. When I moved here there were a lot less group rides than now and I appreciate the variety of very fast rides to support training. Here is a link to a decent one that I hit up last Wednesday morning that happened to have Tom Danielson leading much of the day. I should also note that it also had my teammate, the ever strong Marc DeAntoni lead the ride even more.
I met the ride right after the start and then departed back toward my car as they finished up in Boulder, so the below routing is a bit inexact and I think they change it up each morning.