The well-defined Coldstream Park short course provides a nice accessible loop to get a good burn in after work.
Access during non-event times is easy from the Legacy Trail (multiuse path) parking area off McGrathiana Pkwy. Ride the Legacy southwest to the first culvert and look for the dirt singletrack on the left.
Going clockwise, the trail climbs up to McGrathiana, loops back to the second culvert and then goes across the field to the stand of trees near Citation Blvd. It drops down into a pump track area before returning via the straightaway heading back along the Legacy Trail.