Race Notes: The Sleepy Hollow Half Marathon has the best of fun and scenery. It is the perfect event if you enjoy running for fun or are gearing up for a spring marathon! If you are Boston Bound – Better run here first! The Sleepy Hollow Half-Marathon features approximately 5 miles of carriage roads and groomed trails (meaning crushed gravel and dirt) in the Rockefeller State Park Preserve. The 13.1-mile USATF-certified course also travels along the Old Croton Aqueduct and, as in past years, winds through picturesque neighborhoods in Sleepy Hollow.