There is a shuttle that runs several times a day from DIA for $50 ($90 RT). It could drop you off at the Clarion Hotel which is a sponsor for the PPA/PPM (special rates). I think (not sure) they may run a shuttle from the hotel to the start line.
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I would love to hear from anyone else about possible transport! Arriving at 930am on the 16th! Thanks for reading, all, and good luck in the race!