MikeB-
I used to live in N.E. PA, in Milford. I can't tell you for sure where to ride in the Bethlehem area, but if you go North into the Poconos you'll find some excellent roads to ride. Also Pocono Racetrack (there is a real name I'm sure) is probably within an hour of Bethlehem.
As for dealers, I've been to Blackman's Cycle on the other side of Allentown from Bethlehem and they carry all brands if I'm not mistaken. I do remember not thinking very kindly about the sales staff there though.
Good luck up there.