can you metal detect

Same as above. No trespassing where posted. Otherwise allowed.

I called and asked before, they said They dont mind just as long as the holes are filled and looks like no one was even there.

Yes absalutley just not in the caves. Infact noone is even allowed in the caves due to the bats dieing off so they say anyway. But as for the actual park outside its self yes you can, so go get your metal dector and go have fun & Good luck on your wonderful finding as well! :)

I was there just the other day and saw no signs saying otherwise, with the exception of the caves.

Yes

Yes but not in the caves

As far as I know you can, but not in the caves (they're closed last time I checked).

I don't know why not!! It's public Access...

I haven't seen any signs saying not to.