Airpark amenities

We received the following from Andre Durocher / Pontiac Airpark:

I am building the Pontiac Airpark with a clubhouse, gym, sauna, pool, spa, tennis court, marina, golf holes. I would like to know if most of the airpark offer amenities like this. Thank you.

So… What type of amenities does your airpark include? Who paid for the creation of any amenities? Was it the developer, homeowners association or some other entity? How are these facilities maintained, both physically and financially? Does the airpark carry property and liability insurance on the amenities? Are there restrictions on the use, ie, can you bring non-resident family and friends on an unlimited basis?

Post your answers below. They can provide valuable background information for other airparks, as well as your own.