I just created a Jamaica Plain focused hiking/walking meetup group. For those who are unfamiliar with the meetup concept, participation is free and it's a way for people with common interests to do stuff. Here's the description:
This meetup group is for Jamaica Plain residents who like to walk and hike. Since we are all coming from the same place, coordinating local walks/hikes should be relatively easy. This group may also end up being a relaxed way to meet some of your neighbors.
A few points:
Feel free to join here: http://www.meetup.com/JPHike/