Tomo
What's your goal here? Get that sorted first. Are you doing it as an investment or for pleasure? If you say both, then they will both suffer which is OK as long as its understood and factored in. Once you get that straight in your head do some research and analysis. Compare it to returns you can acheive with alternate uses of the money. If you are not familiar with this get somebody who is to provide some advice. This will be money well spent.
I dont know your personal circumstances but remember that most young blokes need $ like oxygen especially if they are feeding a family or running a business so an asset that is not yielding well and/or not easily liquidated can be a problem.
Not suggesting that this is the case with the airpark. I fly out of Temora but know nothing about the airpark. For all I know it may be a great investment. Just make an informed decision.
Good luck. Be interested to know what you decide.
Scott