I signed up for the Triple Bypass ride again (hope I get in!) and was thinking about the list of notable and interesting Colorado endurance events. Some examples:
Super Longs (human powered from Boulder to Longs Peak and back)
An Unsanctioned Racing Ironman Boulder.
What are yours? If I get into the Triple, I will be training in Colorado for the summer for 6-7 bigger events like these for a summer to remember.