I really need to start carrying measuring tape. Maybe it wouldn't have mattered as this fellow wasn't very interested in holding still, perhaps because it was daylight and Rowan, Jasmine and I looked frightening. I saw him clearly, from about eight feet away (he was that big), moving off the path of a nearby open space into the bordering scrub.
I'm guessing it's a wolf spider and the cephalothorax and abdomen together measured about an inch and a half. It never ran, but didn't want to hang out much to Rowan's disappointment. He was suitably impressed by its size though and the tale of seeing it was almost as good as being able to hold and/or take it home.
This is the first time I've seen one in the wild, and I didn't expect to see it at three in the afternoon. The Butterfly Pavilion has one or more on display if you want to see one up close but behind glass.