Maybe I have a rare climber. Back when Patriot still fit into the tree hide that came with the tank, he'd go on top of it as well as inside. Even now, when he comes out at night, he still drapes over the dials stuck onto the tank (that I can't get off).
When I do eventually move him into a tub, I hate to take away his "PE equipment." I think if he had a jungle gym like what is shown in these pictures here, he'd absolutely love it!