Not that it's that easy to get on the beach here since they piled the sand up at PI Center, but you should not even try to get on the beach there. Newbury police will charge you if you do ... read all about it here, in the Daily News (if you have not already).
"Unfortunately, many people are not abiding by the signs, the barriers, the sand piles and the 'Police Line Do Not Cross' tape," [Newbury Police Chief Michael Reilly] said. "As such, I have issued strict orders to my officers to criminally charge anyone who circumvents the barricades at Plum Island Center. It is unfortunate that we have to utilize such a strict measure, but nothing else seems to work."
There are other public access points ... so use them.