Grabeach wrote:A few more details would help. On or off track? Recognised walks that go to a particular place or exploratories picked off a map? Hard as in distance and hills only or including pushing through scrub as well?
I agree, and it is relative to experience/fitness/ability and expectations. I've done the Canoelands Ridge Trail mentioned in the OP, as an overnighter. Even with a full pack I'd regard it as easy/medium at best, only because it's longish and has a couple of moderately steep hills. Some nice views here and there, but it's just a walk on a firetrail, there is nothing technical or difficult.
Off the top of my head, a few things that might be a step up from that:
In the same general area I've walked from Berowra to Hornsby via GNW/Galston Gorge. Longish with a mix of good tracks/trails and enough up and down.
I've made up any number of walks via the GNW/Berowra Valley/Kur-Ring-Gai Chase NP to a desired length. With good planning it is usually possible to get the train back to the start or vice versa.
If you wanted a significant challenge in that locale you could replicate the 100km Oxfam Trailwalker course, or part thereof. The actual event took me a bit longer than 24 hours but YMMV.
In the Blueys another good one is the Lindeman Pass, albeit some time since I last went down there. You need competent navigation skills in parts of it.
You could also try Bruce's Walk, which I've been exploring myself in recent months.
I've occasionally done some exploratory off track in Royal NP and even some of that can be challenging. Try a traverse of Kangaroo Creek between Karloo Pools and the Engadine Track. The trackless part is probably only about 3 km but likely to keep you busy scrambling and route finding for some time. And you need to add the entry and exit tracks which are reasonably steep.
There are potentially lots of other ideas but it would be good to know more about you.