IF the goal is to do an outdoor haunt that's one consideration. But if the goal is to put a building on the land, then it might be easiler to go with an existing building.
Building from scratch will require a TON of regulations. IT is much easier to remodel a building than build from scratch. That's why in certain areas if someone wants to build a new house they buy an existing house, tear everything down but ONE wall and incorporate it into the new structure. This way they are not building a new building, just remodeling an old one!!!
Most outdoor attractions end up putting some type of building anyway. But if the land is cheap enough???????