This is a paved trail that is good for riding road bikes or walking. There's a pretty steep hill on the north west side of the airport so be prepared to climb a little. The trail can be a bit crowded as it is only about as wide as one car. There are also some wooden bridges that cross some of the marsh land surrounding the airport. It's a very nice trail, and highly recommended. Extend your ride down to Annapolis by connecting with the B&A Trail on the south side of the BWI loop.