The thing about vacations is that you can't just throw your swimsuit in a car and go though (although some might disagree.) It actually takes some planning, cleaning, and shopping to get ready. The stress level leading up to the trip can often be quite high especially in the last hours of preparation. It's the pressure of preparing to leave that gets to you.
You would think we would manage this a bit better since it seems as if we are always preparing for something. We are constantly getting ready for a new phase of life, a big event on our horizon, personal growth, and changing seasons. The truth is that all of life is based on preparation for what is next. I would hope that my recognition of this would make the process a bit less stressful, but apparently that isn't always true. I've actually got to take the time to stop and enjoy parts of the journey (like a well-timed vacation) to see how preparation makes a difference.