Scaling New Heights
Join Date: Aug 2007
Location: North Vancouver, BC, Canada.
You could look into Friends of Cypress Provincial Park, Fraser Valley Mountain Biking Association, Vedder Mountain Trail Association, Burke Mountain Naturalists, North Shore Hikers...that's all I can think of for now. Also, don't hesitate to contact BC Parks if you have a specific project in mind. They recently changed their volunteer program and it allows for a lot more flexibility.
Good for you for looking for the opportunity to give back to the trails!