I personally love this place and have been many times. If you are fortunate enough to live in Adelaide, it is well worth a visit, for an excursion or in your own time. Our group was too large (121 students) to have the education sessions but they are on offer. They did allow for every student to either touch or hold a koala. Below are some photos of what we saw. The only issue we found was not having enough places to eat our food. There is a grass area and a covered area to eat but with that many students, it was difficult, but staggering eating times or smaller classes would be fine.
Gorge Wildlife Park
Redden Dr, Cudlee Creek SA AUSTRALIA 5232
9am-5pm daily (Except Christmas Day)