I've heard about the film.
I went to see a musical about him a few years ago. I thought it was very good. It was before queering and transing everything really took off.
He sounded a fascinating/awful character. His family burned his letters. Can only speculate as to why. I think the film makers will have to do a fair bit of speculating too.
The walk to the lions on the mainland side is quite nice. There's a botanical garden you can park at, turn off by the Antelope. Walk down to the straits and follow the footpath to the bridge. It's a bit noisy from the traffic as you get close but the lions are ace.
It's quite good on the other side too, but a little more up and down.