What do sober people - and in particular, the newly sober - do for fun?

Stupid question, I know – sober people pretty much do what people who partake do for fun, just without drugs and alcohol. But in practice, this seems a bit harder than “just do the same stuff you’d do anyway.” The story is, one of my best friends recently decided to try a sober stint, for a number of reasons. I support him and see no reason why this should interfere with our friendship (it’s not a situation where he feels he needs to cut all ties with people he used to use with, thankfully).

But…this particular friend doesn’t do outdoorsy stuff, so right off the bat that eliminates most of the non-drinking-and-smoking-pot-related things I’d typically choose to do. He’s also not that into museums or movies, and going to shows or clubs or comedy clubs together is kinda out since I’m not willing to be sober for those particular activities myself. I can’t believe how difficult this has been – I want to hang out with the dude more, but all he does now is play video games in his spare time, because he can’t think of anything to do either. And we live in NYC! There must be options I’m not thinking of. I’ve asked other sober folks I know what they do for fun, and explain that my friend and I can’t work it out – they invariably reply with some form of “When you guys figure it out, let me know.”

What have you folks out there who have become sober done in the period immediately following your “detox point” or whatever it’s called, when you’re rattling around at loose ends, not sure what to do with your time? If you let yourself spend time with your old friends who still use, what did you do together? If you didn’t, I’m absolutely still interested in your answer to my first question.

Edit: I’m also interested in what you folks who’ve never not been sober do for fun – I’m sure there’s some overlap here, too.