This depends on why you are looking and your lifestyle. Why, is your business....but if you are say, in school, you would have to probably go to hang-outs (coffee shops, the like). For me it is opportunistic encounters. Mostly all involving work. They are very few and far between. But you only have a couple of really true friends anyway. Be patient, there are a whole lot more lonely moments in life. In fact, you can be lonely even with someone.
I hear expensive grocery stores, gay bars if course, trendy restaurants... Wish I knew cuz I'd be there now! Lol