Well I would say that the best place to start would be getting out of the house. As far as a specific place goes I'm not really sure, any place were people are doing active things?
Personally you could find me at theater events, theater workshops, library, maybe at the gym if I'm bored. Basically though the thing that you need to look for is the loudest person in the room. Or the most obnoxious, or something along those lines. And places that are really competitive, I greatly enjoy competition of any kind.