The very word is soothing. It brings back special memories of childhood. Of being together with the people we most want to be with.
My father, who otherwise was so busy, had nothing to do other than be with us. Mom was finally able to relax, at least somewhat.
I think the heart of a true vacation is neither the fun and entertainment, nor the absence of work. Rather it is a time set apart for presence. That is what will be remembered, and in a sense, can never be taken away.