This ride sounds great! I can't seem to convince any of my gal pals to get on a bike (someone is always preggers, or just had a baby--even if it was a year ago, or think that riding a bike in dee cee is suicide!).
I'd love to hear the details and meet up! I usually go on that arlington loop around the W & OD to the Custis Trail, etc. There are a great many ways to get into Downtown DC for me ....
....also....I highly recommend Bens Chili Bowl.....OR on a sunday after a nice ride to get biking up Connecticut ave to the front page in dupont cir. for their amazing all you can eat $20 brunch and for an extra $5 you get unlimited mimosas.....although it might be best to make this an after ride thing....unlimited mimosas+biking (god forbid on clipless)=bad news....