One thing that seems to happen where I live (though I have absolutely no idea whether other communities do this) is a volunteer police squad. They are all seniors, have lived a life and want to be a part of something. They do some patrols and report in things that are going on, handle crowd control for events or direct traffic at accident scenes and that sort of thing. They also participate in various community service events throughout the community. It might be worth seeing if there is something similar where you live. Also, many schools like to have people who are willing to volunteer in almost any capacity from reading stories to the little ones to helping with tutoring for the older kids. These could all be done on a schedule you see fit to work and would get you out there and allow you to give something back in a huge way