It certainly isn't anything that covers public land policy. 
i'm aware that the two older male children are disney hunters, and presumably have fairly standard attitudes toward land and conservation for people of that demographic. i think it's insane that you would base your voting decision on the hope that trump would override his party's position to impose what you hope are the whims of his unelected children.
What are Disney hunters?
The POV is not standard, there is disagreement among hunters on this issue. But he is certainly on the correct side, IMO.
He doesn't need to impose anything. This view is already the view of the federal government. All he needs to do is nothing to maintain the status.
This isn't the only reason I'd vote for him FWIW.