I was lucky to have parents who planned in advance for summer vacations. I should try that sometime for my own kids they would probably appreciate that as well.
Their planning was early on in the technology age so planning took place on a kitchen table for research instead of a computer. Reservations were made over the phone talking to a real person instead of a quick email or online submission of a form. Charting the course was done with a real map well in advance and not as we were pulling out of the driveway on a map app or gps.
Recording these memories proved more difficult than they do today. Before snapping a picture everyone had to hold still just a little longer for the perfect shot because you only had 24 or 36 pictures on one roll of film. Want to see that picture that was just taken, unless you had a Polaroid you would have to wait until you got home from your trip and sent the film off to be developed. Video footage of the trip was a little later for our family. We eventually paid a fortune for a VHS Camcorder but before then we used cassette tapes to record the audio of our trips.
How did they find things for us to do without the internet? Better yet, how did my sister and I make it 15 minutes in a car ride without having an electronic device that connected to the internet. My parents used the brochure rack in hotels and collected brochures that seemed like fun. They would keep them and plan out future trips using the brochure and the internet. . . kitchen table.