An art run! In addition to the collection at the North Carolina Museum of Art, the museum features 160 acres of grounds and 1-2 miles of trails passing by outdoor art and sculpture. The attached map shows some of the trail options, with a numbered legend of the art.
For a longer run, connect to other nearby trails. The Reedy Creek Raleigh Greenway Trail is a ~2 mile loop, which also connects to the House Creek Greenway Trail at I-440, where you can continue for nearly another 2 miles north.