See donate button at bottom of Friends of the Peak's home page & look at their season's projects for volunteer opportunities.
In response to:
There was a great improvement in trail conditions during the week or two before the race weekend thanks to the Friends of the Peak, the Incline Club, and any other groups or individuals who worked on the trail. The improved trail conditions probably improved everyone's time by a few minutes and prevented numerous trips, sprains, etc. Remember the Friends of the Peak by contributing to them during registration next year.