People who have watched drone videos online may be surprised to learn that the FAA has issued quite a few regulations for flying recreational drones. These include:
Register your drone, mark it on the outside with the registration number, and carry proof of registration with you.
Never fly the drone above 400 feet in uncontrolled airspace.
Never fly over any person or moving vehicle.
Never fly under the influence of drugs or alcohol.
Don’t fly at night unless your drone has lighting that allows you to know its location and orientation at all times.
Don’t operate your drone in a careless or reckless manner.
There are also various state laws, which you can read here. Violating these rules may increase the chance that someone will get hurt in a drone-related incident.