My my my, we just loooove to hear ourselves don't we?
The turquoise are wooden walkways. Pink is ladders. Yellow is ropes and ziplines. I had to colour the lines to more easily select them in PS. It's an entirely mechanical decision as opposed to a design one. The above quick mockup has absolutely no height data. If it would help, I could try to colour code the heights so we can see what's beneath what... I'll see if I can find a moment while I'm rendering a scene later (Squeen'll know what I'm saying. It's like the artist version of 'compiling')