Hit up the bar. So what if you can’t drink? It'll either be a great time, to which you'll be thankful you had a few more childless nights of (albeit, sober) club hopping, or it'll be so terrible that you won't be unnecessarily nostalgic for it later.
Enjoy an all-nighter. Key word: "enjoy." Stay out until the wee hours doing something fun because the only all-nighter you’ll get as a new mom is with a colicky baby.
Sleep in. And don't give me this 9:30 a.m. nonsense. Make it to at least 11 a.m. when you've gotten so much sleep you are actually tired again.