I wouldn't have guessed that Mass Ave would be the *good* route.
You went right by, or through, my alma mater. Whose cross country team often ran (presumably still does) to / in / from the Fells. Which is why I can claim to have been running in the Fells since 1970.
Although there was a bit of a gap. I don't recall running there between the mid-70s and about 8 years ago, when my dear daughter had established herself in the Boston area and got me to join her in a loop of the Reservoir (orange) trail (while my speedy son-in-law did Skyline in the same amount of time). I've since been visiting the Fells every few months, most recently Friday
. Which brings me to the point that ties back in to your log entry: Every single time I go there, I make a wrong turn (or several). *Every* time. Even this most recent time when I printed out and carried a copy of the Fells trail map. (I was about to say the MDC map but that just shows my age again.)