Ideas:
Join a church/temple, and get involved in their various activities.
Volunteer someplace where lots of other people do as well.
Join an athletic activity club. Like a jogging or hiking club.
Join a 12 step program. Meet loads of people that way.
Go back to school and get another degree.
Get a part time job doing something fun/hip. Coffee shop, bar, record store, Cirillas, etc
Join a men's league at a local golf course
Attempt to actually talk to your neighbors