You can go and watch people climb the falls. They have different levels were you can sit and watch and take great pictures and the grounds are pretty level. A with a bad knee went and just wacth her daughter climb the falls and she said she enjoyed it I say go for it and they have people there to help you. The falls were very pretty, someone told us not to go but my husband and I went anyway and we were glad we did it.
Im pretty sure that if you cant climb you cant climb the falls.. there is a lot of big gaps that you need to like jump up, and its kind of straining... and as for the handrails, there arent a lot of them, mostly just rocks and concrete walls...
Norwegian Leeward 1996
Royal Caribbean Sovereign of the Seas 1997
Costa Atlantica 2003
Carnival Destiny 2004
Royal Caribbean Adventure of the Seas 2005
Royal Caribbean Empress of the Seas 2006
Crown Princess 2007
Carnival Valor 2009
Yes, the stairs are very near the falls, not hard to negotiate, handrails and rest stops. And yes, I took pictures of friends (they left me 4 cameras!) and it looked like I was right in the falls with them.