I say let the kids be kids. I grew up camping and my folks let us do what we wanted to, of course with limits. We had "chores" as in helping set up camp but we never fished without hooks. This is the perfect age to teach them how to fish. No hooks is ridiculous in my mind. If you are worried about that just wrap them up in bubble wrap and let them roll around in the dirt. Kids love rocks and sticks. Let them gather all they want until you've had enough. Teach them about what plants to stay away from and those that are safe. They will also love the camp fire. Teach then how to build a proper fire while teaching them safety.
IMHO, too many folks just don't let kids be kids. Particularly boys. They will get dirty. Let them be boys and help them become men, providing the mom will allow it. If she doesn't tell her you won't take them camping anymore.
I've been going through this **** with my grandbabies and my daughter and my wife. Let's just say I've been fighting a losing battle but I'm still fighting.