Why the hell would any one sign an easement over to the government. That is just asking for trouble.
If you don’t grant them the easement they’ll just take your land through eminent domain.
My property butts up against National Park property, it has been in my wife’s family back into the 19th century before there was a park. In fact her great grandfather gave the park some of his property when it opened. Her father lamented that decision until the day he died. The park routinely sent letters to her father telling him what he could and couldn’t do on his own property. He essentially told them to stay off his property, or be prosecuted for trespassing and when they paid the taxes on his property they could tell him what to do until then go to hell.
He passed in the 1990’s and we moved in a house on the property in 2000 time frame. One day after moving in I was in town and my wife heard a knock on the front door and it was some park employees asking for permission to cut across our property to work on park property. Remembering her Dad’s clashes with them she said, sorry but you stay off our property end of discussion. They haven’t bothered us for nearly twenty years. We know the regular employees and they are pretty good people but Rangers are the biggest jerks on the planet, punks with a badge. I put nothing past park administration and rangers.