I’d be up for going on a holiday lights ride, but I do not know the best houses to visit.
On the other hand, I have been wanting to bike the Bull Run Festival of Lights. http://www.bullrunfestivaloflights.com I don’t see anything saying you CAN’T bike, and it would be pretty cool to have a bunch of cyclists going through the Xmas lights (most likely we’d be our own light parade). Of course, this could just be a crazy idea that would never work as I live near Ballston, so it’d be a bit out of the way for me to bike in the dark. That said, I’m still crazy enough to try it!