In reply to David Staples:
I've had luck girth hitching small slings through the snake as hand/footrests to those who come after you if you're doing it as a group.
Also, tunnel should be done without torches for maximum adventure points.
If there's time/inclination going down into mordor (3 big ladders) and wandering through some of the tunnels down there is good fun as well, plus you can refill water from the mossy-waterfall which the ladders lean against which is probably as clean as natural water can be.
Post edited at 13:31