Was reading on the Royal Caribbean web-site where they are putting in these rock climbing "walls" on older ships, so if you aren't on any of the Voyager or Radiance class you can still go for the climb :-)
I actually did it on Radiance a few weeks ago and it was thrilling, scary too, but I think I'd actually do it again. May-be on Voyager next Feb :-)
Here is the link:
http://www.royalcaribbean.com/asp/rc...p?s=&axrf=1917