Well, you are not very far from Charles river. Depending on where in Newton you are. From Watertown square you can go all the way into Boston, museum of science and back. There are a couple of parking lots in the area I meet at teh marsh post with a running group This link has the parking info.www.clydesdale.org/marshpost/parking.html
This is the classic map for the charles river. bostonrunner.com/charles.htm
I don't know Newton as well, but can ask some folks. I will let you know if I get some info.
Here is a nice site with path information. www.newtonconservators.org/trips.htm
There is a bally in Watertown, which is right next door.
best of luck and welcome!
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