Get a BlueBikes pass and enjoy the growing network of bike paths. At the moment I’m enjoying lunch and a beer at the Notch Biergarten, directly accessible from the paths along the Charles river. I’ll be heading home to North Cambridge via the trail from the Arsenal (open-air mall with some interesting spots) to Fresh Pond, then on to Alewife.

From Kendall you can do the same along either side of the river in either direction. There are great paths through North Point (Lamplighter taproom is a nice spot) then over the roller coaster bridge to Paul Revere park, through the locks to the North End and a nice separated bike lane all the way to the harbor.