It's not quite on the North Shore, but I highly recommend the New Charles River Run at the end of June. It is both a 5K and a 7.5 mile race along the Charles. Big race, well-organized, beautiful course. And medals for ALL finishers, along with a BBQ at the end. And good for walkers because the two races are run together, so no matter when you finish, you'll still have lots of people from the 7.5 miler coming in with and behind you!
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