Walnut Creek Greenway extends about 15 miles. Beginning from East Raleigh, not far off Barwell Road, the trail moves westward, has a short disconnection in town near the water plant, passes through several tunnels, becomes an NCU walking trail just off campus, and runs into Johnson Lake. Once at Johnson Lake, there's a trail around the lake to loop back around, which is about 2 1/2 miles. I recommend taking it to the right from Walnut Creek trail because there are steep hills to come down that way, rather than go up, so it's more fun.