It’s a joy to run on the Princeton University campus, and some of the surrounding streets and paths. The campus itself is among the prettiest and most impressive anywhere, with many buildings built in the Gothic style. One can do 3-4 miles around the main campus paths, between Alexander St. & Murray Pl. east-west and from Rt. 27 south to the canal. Elm Dr. through the middle of campus is a good anchor.
There are numerous options to add-on. Just south of Alexander St., there are 2-3 miles lovely paths through woods and around open fields in the Charles H. Rogers Wildlife Refuge/Institute Woods/Princeton Battlefield State Park. There are also some pretty, tree-lined roads with attractive homes. Favorites are Prospect Ave. heading north of campus, and, south of campus we love Library Ln., Elm Rd., and Mercer St. (see our route there).