How do I meet new people, preferably a new girlfriend, but new friends as well?

So against previous fluther advice I started seeing my ex-girlfriend again only to be hurt again as one day she is very nice and the next she completely ignores me. I think I need to go out and meet new people. I have friends now but they pretty much only enjoy drinking which I do enjoy but not 4–5 nights a week anymore.

Not to sound cocky but I am a fun, compassionate, sweet, fairly attractive and intelligent guy and I deserve more than she is willing to give me.

I enjoy computers mostly mac stuff, video games, having fun, being outdoors, talking about stuff, esp philosophy and psychology, drinking and partying, but pretty much anything fun. i am very open.

where can I meet people with similar interests?

Girl or guy I could really use a close friend that I didn’t have to get drunk to hang out with…