Hi ho, everybody!

I'm taking the afternoon off this Friday, so I'll have time to try some new twists and turns on the ride home. Anyone have any weird and wacky ideas to add to this route?
For comparison, this is the route I usually take:
In particular, I'm looking for any little-known bike paths or walkways that might be interesting. I'm okay with a little longer of a ride, I'll have many hours to kill before we leave for DC that evening.