I'm bringing some high school students to a conference in Baltimore end of this month and we want to take a Segway tour around Washington DC. I believe the recommended route to get from Baltimore to DC is the Mark (or Marc?) train and it stops at Union Station. How would we get from there to where our Segway Tour starts? We don't actually have a Segway tour picked out yet... seems like there's several.... so any suggestions on both things items would be much appreciated.