JCP - apart from Blue Lake in summer (which has some excellent granite lines) and one OK little boulder
near Lake J (at the end of the camping sites of the caravan park), I suggest you look into pulling plastic
either at the Sport & Rec in Jindy or AIS centre in Thredbo (which unfortunately are both crap).
I've spent a fair bit of time over the past few summers searching for a summer bouldering spot but most
of the boulders on the main range are crap. Blue Lake and Headly Tarn are the best bet but wrong time of
year to be exploring.
Think about investing in a fingerboard to maintain some fitness over the winter down there.