You live in San Francisco. You find out you're having a kid, which means you'll never be able to hop in the car with your friends on a whim and just go wherever ever again. What better way to celebrate your last gasp of kid free-dom than by piling all your young married friends into a fleet of Priuses and head to a cabin on the Russian River, where you spend a week drinkin' bad beer and worse wine, sittin' in the hot tub, and shootin' BB guns? Am I right??
Oh, and if your friends with kids want to bring'em, that's cool.