Baltimore & Annapolis Trail Park is a 13.3 mile point-to-point trail located near Laurel, Maryland. The trail is good for all skill levels and is accessible year-round.
This is a paved trail that is good for riding road bikes or walking. The trail can be a bit crowded as it is only about as wide as one car. It's a very nice trail, and highly recommended. Flat for most of the way with the exception of a few bridges over busy roads (rt 100 for example). Plenty of places to park along the trail including Marley Station Mall which the trail passes directly behind. Extend your ride/walk around the BWI Marshal Airport (add 11+ miles) by connecting with the BWI Trail on the north end.