Thanks for the thoughts.
It is weird, we took our kids there in Oct 2015 so they would have been 3.5 and 1.5. We also took them to Disney for a day in Jan 2016. Both of them still talk about swimming under the big tower (pool at Paris), tournament of kings and circus circus. Neither one of them remember a thing about disney.
Glad to see someone say 3.5 and 1.5 instead of this "42 month and 18 month" nonsense.
Wait, you let your 1.5 year old swim in the pool at Paris?
Your kids seem smart. They're what, one's five, the other three, and already talking?
That's funny. But not unusual. Do you have pictures around the house of kids at these attractions? They may be subconsciously reinforcing the experiences, keeping them fresh in their minds (especially the younger one).
You might pull out the video camera, and ask the kids what is the very earliest thing they can remember. Do they remember the ride home from the hospital as a newborn? They might. When they are ~13, if you ask them again about the first trip to Vegas, typically, their brains will have moved these files from "active sense" to "a vague impression".
There is a chance your kids possess perfect recall, have immediate, complete access to their memories, and are able to play them forward and backward in their minds like scanning through a DVD. I have met a few individuals with this ability. It is a fascinating gift (and a bit of a curse),
No matter what, I hope you enjoy your family vacation. Sounds like it it going to be a fun adventure!
There are indeed pictures of both adventures in the house but I would bet the Vegas trip is discussed more often. The older has been to AC 5 times and each time we go to wildwood. He talks about the balls at wildwood often too. Forget the monster truck he rode in or the beach, it is all about the wildwood balls. Google it if you don't know what I am talking about.