The Green Tree Snake, Dendrolaphis punctulata, can reach 2m in length. This fellow was less than that, about 80cm in length; It is a diurnal snake and feeds on frogs, small reptiles and some mice. It's an egg layer and is harmless, though a bit feisty when annoyed. It is one of the few members of the Colubridae that we have. Most of the baddies are in the Elapidae.
Even during the day you must be careful where you place your hands!