There is a bikepath that runs from Cambridge all the way to Bedford, and then continues (as a dirt path) to Concord. Unfortunately, if the weather is nice, it gets VERY busy on the weekends, and you may want to avoid it...
There shouldsn't be any significant climbing to get from Boston out to Concord - just some small rollers. I live out closer to Concord and could help with that part of the route if someone could get you out as far as Lexington.....
SheFly



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