Get to know a taxi driver. Ask locals where to go and what to see. Stop by a visitors bureau or welcome center. Hit up a local colleges student center.
When I traveled a lot, I used to start with the local phone book. Not only did it have business information, but government info, and a section devoted to local arts and museums. These days I (gasp) talk to people at pubs or bars or coffee shops. Obviously, if they are annoyed, I let them be, but you’d be surprised how many people are happy to brag about their community.