Hi Emily,

I ride with North Shore Cyclists. http://www.nscyc.org/ They have a bunch of rides during the week and on Sundays. This is my first year with them and I'm sort of a beginner so I ride with the slower group. They're a great bunch of people. Just show up at a ride and introduce yourself and let them know you're new.

There is also Charles River Wheelmen http://www.crw.org/ They have a ton of rides too. I belong to the club but have yet to ride with them. It seems to rain every time I plan to!

Good luck,
Patty