Ah yes, but the Blue Mountains are a lot closer for a Sydneysider than Collingwood Ont (presumably Ontario Canada).
And it doesn't take much imagination to go for a bit of a bush walk and leave all of those Niagara-fallers behind. If you do the "ruined castle" walk, for example, once you leave the Scenic Railway/Katoomba behind you are likely to only meet a couple of people all day. Plus there are plenty of quieter places in the Blue Mountains outside of Katoomba and Leura.
