James - Organize it and I'm there!
I also have some experience riding in DC. I've never had problems
bringing my uni on the metro, though once as Wogri and I were leaving
the Vienna metro station on our way home, the guard said bikes were
only allowed between rush hours (I think it was 10 to 4) and that we
shouldn't have been allowed to bring them on. But obviously the guard
that let us on didn't care, so...I don't know.
Anyway, the Mount Vernon trail is fun, it starts 16 miles south of DC
and goes through Alexandria on the way. There's a metro in Alexandria,
so it would be possible to start there, ride the trail 8-10 miles to
DC, and when we're tired out, just take the metro back to our cars in
Alexandria. But that's just an idea.
As far as urban trials, there are public parks where security guards
shouldn't be an issue, but I'm not familar with which ones are
conducive to uni-trials. Old Hell on Wheeler Trip Glazer honed his
skills around the American University campus, and a rock strewn creek
nearby. Here's one of his 'vids' (http://tinyurl.com/2mfppf).
--
hell-on-wheel
"...or the confluence of rare meteorological phenomena."
-George Peck
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