He needs to understand that he's not on his own anymore. Things aren't like they way they used to be pre-kid. It's a part of the lifestyle change required. If he wants to go camping and the kid doesn't, it's not about him and his needs anymore. Get used to sacrificing. There's many more years where that came from.
If he does go camping, it's not to sleep down the street too. That just sucks. A part of the experience is to be with your friends ... and this really isn't accomplishing that.
I don't mind kids, but it can be difficult hanging out with folks that have em. There's all kinds of adjustments needed from everyone to make the friendship work.