Three weeks? heck, after four I'm still figuring out how to get out of the house to buy milk. I never mind trekking the Grand Canyon!
We took our son on his first overnighter when he was four (Years, not weeks), and that was at a drive-in Provincial Park. He's nine now and we just had what feels like our first season of serious camping, and even then, we weren't far from civilization.
I just don't get this.