Reentry is always tough after an extended weekend. I have developed a thick skin over the years and have a series of tricks I rely upon to make it easier on myself when I have to return to work/stress/the daily grind after a few days off. Extra iced coffee during the day, frequent breaks to talk to friends, a 'light' to do list so as not to feel overwhelmed or inept, and daydreaming. All of these things help, but there really isn't much you can do to brace yourself when you leave behind such lovely times.
I am not kidding, this is what color the world is on vacation:
It did not look anything like that outside today.