You can choose the life of any celebrity and in their 24 hour span yo can have an insight in their life.
Explanation:
Say you were Quentin Tarantino for a day in the middle of the shooting of his recent film.
You would be waking up to check on the production schedules with your assistant as you contact the editor to send you the dallies and then you will be looking at, or preparing the shooting script for the day.
Then, you reach the location and brief the actors on their job and meet your essential crew and oversee their actions and then you have the whole day for the shoot after which you go back and see the progress.