Apple Picking - Fresh air, hanging out at a nice orchard.
Town Fairs - Fried food, fun rides, and trying to win nearly impossible carnival games. Fairs are a great place to bring your significant other. Riding the ferris wheel together is always romantic.
Haunted Hayride - Kind of brings you closer together when you get scared.
A Long Drive - One of the best things about fall: the colors. Take a long drive through the countryside with the windows down and that crisp sweet air.
Rent a Cabin - Who doesn't love a getaway with their favorite person? A weekend trip is a wonderful way to change up your routine.
Game Day - Even if you're no super interested in football, the games can actaully be pretty fun. Make a fun day of it. Start with tailgating, catch Redskins or Ravens games, and then go out after to your favorite sports bar.