Use questions like this to help you establish your character. The answers may not appear in your story but knowing something about the character before you start writing about them will be enormously helpful. You don't need to know each and every little detail. What you want is enough information that you can write clearly for them, knowing how they would react to a situation and why. The reader will pick up on the fact you really do know your character (even if they do this subconciously, in many ways it is better if they do pick up on this that way) and the writing will flow better as a result.
Of course, working out what your characters' favourite times will tell you so much about them. Do they curl up with a good book because they can't face what is their real life? Why can't they face it? Dig deep. Maybe you will surprise yourself with what your characters show you about themselves. Use that.