FAA Regulation

1 calendar month. 7 days. 14 days. 

Remote Pilot Certificate, Registration Card, and a copy of the Completion Certificate for the Recurrent Training.  Remote Pilot Certificate and your logbook. Remote Pilot Certificate and Registration Card.

The owner of the aircraft. The operator of the aircraft. The manufacturer of the aircraft.

must not cause injury to a human being equivalent to 11 ft-lb of kinetic energy.  must have an approved type certificate issued under Part 21. must not cause injury to a ...

It must not contain exposed rotating parts that can lacerate.  It must not contain exposed rotating parts that can lacerate and must not cause injury equivalent to 11 ft-lb of kinetic energy.

Turn down the intensity of the light.  Look down at your controller screen to fly the drone and find the obstacle. Turn off the strobe light.

600 feet AGL. 500 feet AGL. 400 feet AGL.

No, the other people in the park are not on notice.  Yes, as long as the park is not busy enough that it would be considered an open-air assembly of human beings.