Babysitters. Slumber parties. Summer camp for the kids. Ship them to relatives for a day with their cousins (and make sure to reciprocate).

They're practically going to be few and far between, but taking a day for yourself (or for just you & your spouse) while they're still young doesn't have to be a dream!

[Disclaimer: Post may not apply if they're still babies. If so, then yeah, you're screwed. ;-) ]