P44 I realise that you've already been but at 12.30 there is a public feeding of the giraffes (this is the only time that the giraffes can be fed as we have poisionous browse in the zoo too) Other than that one the other hands on things are the encounters (cheetah, red panda, giraffe and big cat)
And at random times in the day guides will bring out reptiles for people to touch