Do you like to socialize with your co-workers?

There are good folks in my department, and I have some great friends there, but I find it really hard to deal with them all at once, at happy hour. I’ve managed to avoid it all year until this weekend, when a huge contingent from my department showed up at my regular bar! I guess I’d prefer to spend time with people because we want to, rather than because we all happen to work at the same place and it is assumed that we have no way to make friends outside of work.

Do you socialize regularly with coworkers? Or even your boss? What do you do together? Do you feel obligated to be sociable, or do you genuinely enjoy it?