I used to be one of those people that was concerned if a three day schedule was off by 15 minutes. I have since learned better.
Sometimes the best things happen when you do not plan them.
Although it is so much fun to make plans, and to dream about things, and learn about places that you might travel to, sometimes it is better to throw care to the wind and be spontaneous. These are the times when you should care not what you are to do, but do what presents itself.
So I have been learning, anyway.