One of the big parts of DB and one that everyone suggests up front is getting a life. Of course there are lots of good reasons for that.
Obviously if we have old hobbies and activities we've stopped doing when we got married, revisiting them is a good place to start. Reconnecting with old friends is also good. And as pearlharbr pointed out, everyone starts working out again!
But what about actually going out and meeting new people (in a friendship kind of way, of course)? What if so many of your mutual friends came out of your WAS' circle and work and so that's a bit awkward? What ways have you all found that works for just getting out and meeting people? It's weird to ask, because it sounds like such a basic human thing, but really, it's been so very long since I've been alone! And what do you find yourself saying when the inevitable questions arise, "So, are you married?"
I guess much depends on where you live, and surely things like Meetup and other web/social-networking things can help. Anyway, I'm very curious to hear other experiences?