The two little guys in my avatars have been taught from day one, what a treasure our beaches are. Camden, at the ripe old age of 3 goes to the beach with a bag to pick up anything that's been left upon our arrival.
He fully understands at the end of the beach day, no trash is left, any holes he's dug are filled in, and you leave with what you brought.
He also understands, the turtles are a special gift and they may not be there if you don't make sure it's safe for them to be there, He's 3. How old do you need to be to get this?!?