FAA Regulation

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.

Person manipulating the controls.  Visual observer. Remote Pilot in Command (Remote PIC).

Yes, it will cost $5 per aircraft. They don’t need to, your aircraft are already registered and your pilots are certificated. No, they will have to obtain operating authority from the Department of Transportation.

Fly as a recreational flyer until you pass the recurrent training online with the FAA.  Continue flying as a Remote Pilot, there is a 30-day window to take the recurrent. Fly ...

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.

Use a “buddy box” system with two controllers. Use a radio system to instruct the non-rated pilot. The Remote PIC cannot supervise a non-rated pilot.

Compliant with Part 107 when used with a first-person view (FPV) camera system. Not compliant with Part 107. Compliant with Part 107.

must not cause injury equivalent to 25 foot-pounds of kinetic energy upon impact. be operated in accordance with the operating limitations specified in the approved Flight Manual. be 0.55 pounds or ...

The aircraft’s Document of Compliance The manufacturer’s Means of Compliance. The Certificate of Aircraft Registration. 

Civil and public aircraft operations. Public and military operations. Civil operations.