The North Jawbones in particular is a really nice crag in a lovely setting, though not for really hot days. The classic routes were all well described in the old Melbourne's best from Rock. I assume the new Melbourne Selected is even more detailed. The truth is you can climb pretty much anywhere on that rock.
If I had 2-3 days I would not spend it in the Cathedrals. I would drive west. Even more so if I was looking to consolidate multipitch gear climbing at grades 10-16. The Cathedrals a great for a long day trip from Melbourne and will entertainingly fill more than a few of them over the years.
I haven't been back to the Cathedrals for several years but the last time I did the ridge walk the prickles were past the point of pleasantness. If you are in Melbourne you can have one of my old ropes to do the abseils.