There are going to be many things to do that are particular to what you need while camping. These would include chairs, mats, grills, and other outside and inside items.
Some that we reminded each other of while arriving at a park include:
Fill fresh water on the way in if not water hookups
Look for the best way to back into site if not pull through, for overhanging branches, for best level spot, slide out space, direction of view if changeable, distance to utilities if needed
When leaving there are the normal items you will find in checklists like lower the antenna, unplug the trailer, etc. while many of the things to do are specific to you and the family.
We remind ourselves to slow down and walk around the trailer, both of us, until we are sure we have done all we need to do.
The most important thing, which is forgotten every time there is a problem, is to slow down and relax. No one is in that much of a hurry that they can't double check the important items.
Have fun since you wil learn as you go.
I went and found some checklists and on edit they are here:
Some general checklists
Simple but great lists
and if you do a google search you will find too too many more.
Again, have fun.