I'm not sure it's the best location for a campsite - it has no easy access to water and there are lots of mosquitos.
I've seen people camping on the helipad behind the restaurant, this is a flat open area close to the toilet block and washing facilities and with less mosquitos, it may be better.
I was thinking perhaps it might be a good location for a bird ringing station? I'm not familiar with the requirements. Or, as Mr Tai says, replant with birds in mind. One thing to beware, it's a regular area for visitors and things left there could be vandalised or stolen. I've had items stolen by casual visitors, even when I have hidden them.
Maybe the best idea is just to let them remove the buildings (with care not to destry the surrounding trees and bushes), and then think what might be done.
If anyone really wants to stay under a roof on Po Toi, I can probably make arrangements - send me a PM.