Have you looked at PPTC yet. They do rides all over the area. For some of them I bike to the start, others I have to drive. There's a mulit level ride leaving from Pierce Mill in Rock Creek next Saturday. I've done that one before and plan to be there this weekend. It's a good ride at 25 miles and only a few hills. I'll probably add a few miles before and after.
http://www.bikepptc.org/
If you decide to show, post or PM your bike description. I can fill you in on some of the local routes.
I'll be on the blue TREK 750 with the rear rack-pack.