Bring the whole family to Mount Vernon's Fall Harvest Family Days!  Enjoy wagon rides, wheat treading in the 16-sided barn, a straw bale maze, and early-American games and music. Kids can make their own cornhusk doll, cook over an open fire, and dance 18th-century steps. Visitors can also take advantage of the Potomac River sightseeing cruises, which are half-price this weekend only.