Small park is doable.
Gulches 80 acers,
The Flats, 68 acres
The SHOP 100 acres
DPG was 40 something
and so on.
What ever your property will support as far as demographics, go with that. If it's for bone stock 4X4's, so be it. If it excludes the bigger built rigs, well it suck for us, but we all started in something, in stock form. There are so few places in that area to go to, I am sure if it's run right, then it will be a success. Charge a reasonable amount. keep the place up. Create a decent place to park(this is where Skip at Gulches really falls behind, if his parking lot is wet, then it is a total cluster F*** to get in or get out, and nasty's up the road, therefore, he can't open because of this pretty often.
make some reasonable rules, like NO DRINKING, No ATV's, seems this crowd every where is responsible for all the spider trails, creating excess run off, and they are the ones mostly throwing out the blue cans(for lack of space for trash). Forget having your own food place. Allow groups like churches and so on, to come in and serve, and make a little money. Trust me, that is one big headache that you don't want.
Forget the hour thing. Set hours for start to wheel, and hours for off the trails.
find yourself a club, or a group, to help maintain the property. Man power will be needed.
Small parking space? have someone directing traffic. stack em in close, so you can get them in.
There's a lot to think about and do, but like I said, if it is run right, and you build it, they will come.
No, you may not support the big boys, but there is a hellova lot more stockers out there with no where to go, than there are big built rigs