When you already know where you’re going and when, then you have some stuff to do.
What are you interested in?
You’ve heard that the Eiffel tower is a must, but you would like to see the Notre Dame as well. So the question is, what are the local attractions, and what are YOU interested in? I usually don’t see all the things that a travel book suggests. One of the reason that i don’t care that much, and I also don’t want to be a tourist who’s running all over and check out things from his long list. Therefore i have some things in my mind that i already know i don’t want to miss, but most of them i pick up from other travelers or locals. They know more cool things than a stupid travel book.
I don’t make an every day schedule, just if i have a short time at the destination, then a lazy ‘what to do each day’ it comes pretty handy.