If you are accustomed to running or riding on flat roadways expect to be tested on the North Shore Trail. The one downside is the trail's growing popularity. Weekends often find it crowded. Try early in the day and weekdays. You might also call ahead if it has rained in recent days.
Mud can make portions of the trail impassable.
The easiest trailhead to find is the one in Rockledge Park on the north side of Grapevine Lake's dam. It's just off Fairway Drive. Contact the Corps of Engineers at 817.481.4541. They also have a Trail Hotline at 817.481.3576.