In Florida, a police officer may interfere with your freedom of movement only if he has observed unusual activity suggesting that criminal activity is afoot and that you are involved. In other words, if he has a reasonable suspicion that a crime has been committed and you may have been involved. Even if the officer is mistaken, however, you do not have the right to keep walking. As long as the officer has a good faith belief in your connection to criminal activity, he is allowed to detain you. Stopping you is one thing, however. It doesn't mean that you must answer all of his questions. See If I am not under arrest, do I have to answer a police officer's questions?