Going from the LV to boston, you've got a few choices
Drive:
313 Miles -- this is the route I suggest..
from:allentown to:41.071069,-73.894043 to:boston - Google Maps
(the 33 to 209 to 84 route is good too, it's much more scenic and there's much less traffic, but it can take a little longer, depending on traffic)
Bus:
You can get a bus into New York (look up Bieber or Transbridge) ($35ish round trip)
Take the subway down to chinatown ($2)
get a chinatown bus up to boston
(such as
Lucky Star Bus, Boston - New York Bus Service or you could look at peter pan or greyhound, which may put you in an easier to get to part of the city)
i personally think the buses are kind of shady, and would rather take the train...
Train:
take the Bieber or Transbridge buses into new york
you can walk from the port authority to penn station
where you'll be able to catch a train to boston (try to make reservations with amtrak in advance, especially if you want to use a AAA discount)
Airplane:
you'll need to get to the airport (ABE, PHL, EWR..) and you'll need a taxi from logan airport to where ever you're staying