Just fly in.
Decide whether you want to park on the tarmac or the grass. Both are at the western end of the aerodrome. Either way, there's only one AVGAS fuel point (western end of the GA tarmac area).
Parking charges apply - more if you want to park on the tarmac. Whether the charges result in the "extorting" of people is a question that only a court can decide and on which I won't comment.
Exit is via a push button gate at the facility at Gate 3. You can't miss Gate 3: It is a toilet block and donga with coiled razor wire along the eaves to welcome visitors.
Getting back in requires forward planning. You need to program the working hours number and after hours number to call to get airside, and call the appropriate number in advance of your preferred access time. My experience is that the security and operations people will always do their best to fit around GA requests. Just give them as much notice of your entry timing preferences as practicable.
