Hemlock Bluffs Nature Preserve is a local park run by the Town of Cary. While it is surrounded by residential areas, it is in a unique spot with unique features. There are a couple of loop trails rated easy that offer a nice experience for hikers of all ages and experience. There are a number of observation areas near the bluffs that offer some great scenic views.
Since this was a winter hike it surprised me that the parking lot was full. It was a great day for a hike though and I walked each of the loops totaling about 3 miles.