The following links are to websites that I felt were worth a look. I can think of nothing better than everyone pitching in to contribute to the upkeep of what I consider a local treasure.
BC Recreation Site & Trails Branch - Volunteer Handbook
International Mountain Bike Association (Canada)
Penticton & Area Cycling Association
Penticton Outdoor Club (Hiking)
BC Recreational Trail Management Guide
US Forest Service - Trail Building Manual
US Forest Service - National Trail Drawings and Specifications