The MDC has done some nice work on the bike paths along the upper Charles. Unfortunately, they aren't finished and the most of them don't seem to be on ANY of the bike maps.
I think this was the first time I had ridden (certainly that far) in about 17 years. Being unemployed for the summer does have some advantages. ;)
(We do have a stationary bike, treadmill, and stair machine in the basement which get some use; I actually used to get more exercise when I was traveling and working out in hotel gyms. I used to have a real but crappy bike, but sold it sometime after we got married and before we moved from Waltham to Newton.)
On the other hand, it looks like I am not going to get to swim in Crystal Lake in Newton Centre this year. It closed for the season already on 8/21! I figured it would stay open until Labor Day.