I was half thinking that myself. I did a quick Google of "client pleasurewood hills" and got up some interesting sites of companies who have done work for the hills (half hoping to maybe uncover something). This is where this guy popped up and also a cartoonist called Banks, who designed the park map.

Other finds were the company who provide the sea lions and parrots, the lighting company for SA, a mural designer and the usual PR and web design companies, and that article about Wipeout I posted in the other thread.