Here's an oldie but a goodie, from 1955 its Gibson's Greetings from Disneyland card. Its not a postcard, its more of the standard greeting card, but from the new Disneyland!
"60,000 persons daily" those are the days I like to stay away from the park
I suppose you should use the inside of the card to write your message, but I'm guessing Ruth thought it was to nice to write on.
Ruth used every available square inch on the back side to convey her lengthy message... Disneyland is "really a fantastic place" - I agree. Ruth was getting ready to fly to Honolulu on Pan Am, how long of a flight do you think that was in 1955?