How 'bout looking up a running club in your area? Or are you not running anymore? That would be fun...
I work at my local high school's track and field events. I am a timer for the 4 track meets in the spring (HS boy, HS girl, HS co-ed, and MS), and a course pointer (hey buddy, go that way!) for the one cross country meet in the fall...Timing is fun bc I get to hang with about a dozen other grownups making smart@ss comments for 4 hours.... If there is an activity that interests you, i.e. tennis, you could see if they need any help? Just a thought...