Not true. There was a "travel advisory" for Pakistan in 1981 but that didn't mean you couldn't go there. Pakistan wasn't Cuba or North Korea or North Vietnam. It was even our ally officially. You can see a PDF of the advisory here.
You would have needed a visa in advance from Pakistan to go there. It says so in the advisory. Just how hard or how easy it was to get one, I don't know. But Pakistan was not on a State Department "no travel" list for US passport holders in 1981.
You replied to me, but that is not my post.
WHERE was Obama born in Hawaii? Is he paying legal fees to keep his birth certificate hidden because he was actually born in Kenya? I, as an American citizen, have the right to know if Obama is a natural born citizen or not (natural born citizenship is a requirement to serve as President per the Constitution).