Well I tend to think a couple of ways on this
First off...yeah Daddy wasn't too bright being as ill prepared as he was (and yet he's allowed to carry a saw, a potentially very dangerous instrument)
Second...anyone can get lost, disoriented, whatever..especially someone not familiar with the environment (which Daddy Dominguez was not)
Third...ok, I didn't bother reading the piece on them being found...taking shelter in a culvert? Makes it kind of hard for searchers to find you for starters, you've got a saw, cut down some trees dude! Build a lean to and burn the rest. Oh well, I'm glad they're ok, but I keep hearing the theme music for Gilligan's Island...