Here are several accounts by people who have circumnavigated Pikes Peak by human power:
Steve Bremner's June 2, 2012 Ring the Peak run.
Steve Bremner's Clockwise run on June 11, 2011. 100km in 16hrs 48mins.
Steve Bremner's account of 4 men running 64.5 miles in 17 hrs and 30 mins. on June 12, 2010
Carol Beckman's diary of a Ring the Peak backpacking trip.
Scott Morris' diary of his illustrated bike ride on the Ring the Peak Trail.