Hmm, 60s and 70s? Not sure if these are from that era but we played a lot of Monopoly (which I found boring after a while), Risk (fun!), Go to the head of the class (early kids version of Trivia Pursuit).
But mostly we played card games, penny ante poker, Crazy 8s, Rummy, Canasta and so on. My family never went on a long or short trip without a deck of cards.