My family has been going to Disney for a long time, and we've gone with people who we made some great memories with, and we've gone with people who we made not so great memories with. Thankfully, the good memories stick out in our minds more than the bad. We're continually bringing up things we did years ago, "Hey, remember the time Aunt Sue wanted to cut holes in her shoes for her blisters to have room!" It cracks us up to remember.
Now, that being said, there were three people I remember that soured things a bit. One was a friends mom. My friend, and her mom and dad went with us one year, and for her it was one thing after another. I truly believe that sometimes, you make or break your own vacation. I know somethings happen that are truly bad, but she was just a complainer. No joke, every meal she got she sent it back because something was wrong. There was always something wrong. Just her meals. Haha! It's like, oh my burger has tomato, I was for no tomato, go make me another one. I'm like, really? Just rake it off. It was embarrassing sometimes.
The other two were my grandparents. It sounds like this is a story that is familiar with some people. My parents paid their way, but they were sourpusses the whole time. The weather was bad (afternoon thundershowers that cool down the evening), the food was gross, things were too expensive (my parents were paying their way), too many people, etc etc. The best time my grandfather had was going around with the landscapers one day at CB taking cuttings off of some of the plants and asking them questions and stuff. (He owned a nursery.) I thought it was strange, but at least he wasn't with us complaining.
Now, the best person we ever took? My other grandfather who is no longer with us. Yea, he woke up early every morning and whistled while he was making his coffee and woke everyone up, but he never once complained. He was in his upper 60's and kept up with us the whole time, didn't complain about the heat or the people, and even though the food was out of his comfort zone, we always managed to find something he would eat. We got him on every ride, and he was laughing so hard on Splash Mountain that we thought he might have a heart attack.
Now I prefer taking well behaved kids. I like seeing the parks through the eyes of a child, all of the wonderment, and amazement. It's fun!