Just as an update....
I am 30miles north of Boston near Nashua NH and rode down rt4 through Chelmsford, Billerica, Bedford then on the Minuteman Bikeway to Cambridge. Once in Cambridge jumped on the Charles river bike path through Boston on the exceptional bike lanes then onto the SW Corridor parkway. I will have to admit that riding through the Blue Hills was tough and should be avoided as it sapped the energy right out of me.

I used Google Bicycle Maps and it worked out fine.

Great ride and would do it again!