It's a Death Adder, one of the most venomous snakes in the world.
Eeeeek! Apparently they're very rare to see in the wild but my Mama has been walking (carefully...) past this one on the path for the past week. She's crazy (in a completely lovable way of course ;) I don't think I could live in the wilds. Nope. T definitely couldn't. I was very happy to see this snake but I don't want to live with him!