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Overplanning is not the same thing as overscheduling. There is nothing wrong with being able to be your own tour guide when you're travel hacking, but there is no sense in scheduling every minute of your vacation. I have personally made this mistake and things happen. Weather or a union strike on the metro system will inevitably require you to pivot, but being prepared will keep an inconvenience from becoming a headache.

It's your dream vacation. Buy the book! The twenty-dollar investment will pay for itself many times over in advice to save you time, money, and ensure you have the best vacation possible. Many tourists ruin their own vacation because they have the wrong expectations. Find the hidden gems, the coolest coffee shops, and the secret entrances while other tourists spend half their vacation waiting in line and complaining.

Pro Tip: Major tourist sites and museums can be closed on different days of the week and may even offer Free Entry days. Don't show up to see the Mona Lisa on Tuesday, when the Louvre is closed.