M.J.
My parents live in St. Louis and they do lots of stuff. They are active in their community at their church and library. They go to a bible study, which is not affiliated with their church and have met people that way.
Where I live there are Adult Education classes at the park district which are a small fee and they have cooking classes, scrapbooking classes, exercise classes and much more. There are lots of people in my area who hang out at the YMCA as well as do lots of volunteer work.
I'm sorry I don't have more specific information, all I have to go off of is my parents (they are in their mid 70s) who I've been told are "not the norm". My mom plays tennis once a week, my dad walks every day, they go to about 50 baseball games a year, go to the theater, just basically live it up. If I lived there, I still wouldn't see them!