When the biggest challenge is to simply complete the event...
...perhaps the Colorado Trail Race is for you?
The Colorado Trail Race: 470 miles and 65,000' of elevation gain winding through the Colorado Rocky Mountains from Denver to Durango. Approximately 300+ miles of singletrack at elevations ranging from 5500' to a gasping-for-breath 13,200'. The CTR is a monster! If the monster is in a good mood, you may experience Colorado's beautiful sunny blue skies and wildflowers blooming as far as you can see! But, be warned — the CTR's mood can change on a whim, and you may just as likely find yourself getting besieged by massive hailstones and lightning bolts. In short, don't come to this race unprepared — no one will be there to rescue you.
The CTR is similar to The Arizona Trail 300 and The Great Divide Race. There is no entry fee, no support, no registration, and no prize money. It is a self-timed ITT (Individual Time Trial): all that is provided is a route description, a suggested start time, and a list of results. However, all individuals participating are strongly encouraged to donate time or money to the Colorado Trail Foundation. Without them, we wouldn't have this trail!