I met lots of great neighbors through volunteering. There's a Cozy Rhody group that picks up trash. The PNPP.org plants trees in spring and fall. You can volunteer at theaters, like Wilbury, and get to see a show for free.

I met some good friends through Meetup. Join groups that interests you. There's a great beer group, a few great hiking groups, etc.

Get a dog. You'll meet plenty of people if it's an approachable dog. I take mine for walks in my neighborhood, and to the Hope Street Farmers Markets.

Go to The Flea and farmers market. They're free to browse. Lots of good people there.