Bike to the Sea has been working for years to advance rail trails (old rail beds converted to walking/biking paths) and specifically the rail trail that leads from Revere, MA, and points prior to that town. to the Atlantic ocean. They work with very limited funds but limitless vigor and enthusiasm to accomplish this goal with virtually all volunteers. Regular meetings, social events, and fund raisers are held and grants are applied for to augment their work.
A great organization that can use any help and whose finances all go toward moving their project forward.