Your experience definitely depends on WHEN you go. When I went, it seems as though the park was full of families with young children and the weather wasn't the best.
Indoor greenhouse was already closed - at 4pm on a Saturday! And there weren't many animals at their "petting zoo"...in which there are "No Petting" signs all over the place. They're more like a few goats, donkeys, a coupla pigs, Chinese Silkie chickens, a few small horses/calves, and peacocks that are behind wired fences that you admire from a distance. So families with kids, please take note.
I believe you can pay for pony rides and such. Other than that, there's little-to-no interaction between animals/humans.
It's a newer park, not as established as High or even Erindale, so no extraordinary vegetation. ALTHOUGH I must note that they have a few nice modern structures, an indoor picnicking area with boat docks, a community centre (??), and other. They also have a splash pad, but obviously it wasn't on as the weather was not warm enough.