If you're looking for an "easy" trail race, i.e. fairly flat course, then consider the 2013 Rubber Ducky Half Marathon, & Miler & 5K that uses the 10km trail around Burnaby Lake.  I've run the race a couple of times in the past and enjoyed it. The online race course description is: 

"This beautiful 21.1K & 7 Mile course circles Burnaby lake, giving you the opportunity to enjoy fresh air, exercise and more chances to view birds and animals in this wilderness environment. Join other walkers & runners on this scenic course throughout the trails of Burnaby Lake.  Located in the middle of the city, Burnaby Lake Regional Park is a stunning wildlife sanctuary. The lake was created by a glacier 12,000 years ago and its shores were home to sawmills in the late 1800's."

For more information, visit the Race Information webpage at: http://www.events.runningroom.com/site/?raceId=9222