Hey, come ride with me! This year, I'm signed up for one metric century, and plan to do a fundraising ride in Columbia that is as much riding as you can manage in 24 hours. I'm thinking of riding the GAP this year, too.

I ride mostly trails, and there are lots of good ones, many paved, that would get you off Beach Drive.

Also, check out the Potomac Pedalers; they have frequent group rides that might appeal to you. I've been on one (a D ride, which is just about right for me), and enjoyed it.