*Parks
*Libraries
*Museums
*Malls
*Beach/ River/ Lake if you live near one
*Your neighborhood
*Religious meeting places
*Volunteer work
*Classes
*Bookstores
*Flea markets
*Clubs- like book clubs, not night clubs
*Seminars
*Bus station (yes, I had a friend who hung out at bus stations just so he could talk to random people and he made a ton of friends this way)
*Sushi bar
*Gym
*Golf course
*Have you tried meetup.com? I've heard mixed results there.
*If you have a dog, a dog park.
*Donate money to a charity and they'll invite you to events.
*Go check out forums for people who like doing certain things, and you might be able to meet somebody local.
*Open mic night at coffee houses
*Poetry readings
*Sporting events
*Convention
*Magazine stand
*A play
*Neighborhood watch
*If you ride bikes, a bike path- similarly, if you jog, a jogging path
*Shows, like car shows, gun shows, whatever interests you
*Home improvement stores. I've seen people make friends over breakfast at Lowes... not sure if all Lowes has doughnuts in the morning.
*Get involved in politics
*Join a demonstration
*Check out the Activities section on Craigslist
These are things I came up with off the top of my head. I bet you could think up some more if you sincerely tried.