I'm not a google maps kind of guy, this is going to be lengthy. Take woburn st south all the way to Eames st. Rt on Eames st, left onto rt 38 south.
rt onto mountain st
left onto winter st, turns into pearl, turns into beacon , following rt 128
at end turn left onto winn st.
go under 128 and turn rt onto mountain rd
turn left onto burlington st ( newly paved)
left onto pleasant st , right onto arlington st. ( horn pond on right)
rt onto lake, left onto woodside (turns into wildwood)
rt onto fletcher, go straight across church st onto bacon
rt onto mystic valley parkway
rt at first rotary, straight at 2nd rotary onto chestnut st
left onto pleasant st ( route 60)
left onto the MM bikeway
follow to the end
go left for 50 yards when you get to the street( backside of parking garage)
turn right onto bike path
turn right just past the bridge overhead
take sidewalk/bikeway over bridge
shopping center on left
continue (carefully,lots of driveways) to gas station
hit ped cross walk button( this is between 2 rotaries)
take left onto pathway around fresh pond
rt at huron ave , left onto aberdeen ( both have bike lanes)
left onto mt auburn st, rt onto coolidge ave
left onto coolidge hill, follow through parking lot ( watch grate at gate)
building on left, grass on right
take left onto sidewalk , go left at BBN through crazy 5 way lights( wait for walk signals)
go over right side on Elliot bridge
once over bridge rt and left onto bikepath
river on right
take arsenal st to market st
you'll have to figure it out from there ?
hope this helps