Most of this information comes from the FAA website. See more details here: https://www.faa.gov/uas/getting_started/fly_for_fun/
The recreational use of a drone is the operation of an unmanned aircraft for personal interests and enjoyment.
FAA recommends that recreational flyers follow community-based safety guidelines, as developed by organizations such as the Academy of Model Aeronautics (AMA). http://www.modelaircraft.org/
Safety  Guidelines:
- Drone must be under 55 lbs.
- If Drone is over 0.55 lbs. it must be registered
- Always perform a preflight checklist and inspect the drone before flying
- Do not fly in a careless or reckless manner
- Do not fly under the influence of alcohol or drugs
- Do not fly at a location where the activity is prohibited
- Sensitive infrastructure or property such as power stations, water treatment facilities, correctional facilities, heavily traveled roadways, government facilities, etc.
- Fly below 400 feet above ground level.
- If operating from a structure, must remain within 400 feet of that structure.
- Remain below any surrounding obstacles (Buildings 400 feet or higher.)
- Do not fly beyond your line of sight and use a spotter when possible
- Do not fly in high winds or reduced visibility
- Do not fly over unprotected persons or moving vehicles, and remain at least 25 feet away from individuals and vulnerable property
- Do not fly over stadiums or large events
- ALWAYS See and Avoid manned aircraft
- Contact the airport or control tower before flying within 5 miles of an airport
- Be aware of Temporary Flight Restrictions (TFRs) that affect the operation of unmanned or remote controlled aircraft
- To find any TFRs in your area and/or contact control towers check out: AIRMAP https://app.airmap.io/