The Halfa Hill to Harbour is exactly that. You will start the event at the 6km point of the Hill to Harbour Course, which is just near The Station (Old Railway Station) and runs the last 6km of the course past Queens Wharf, Honeysuckle and Newcastle Marina.
A 2km run from the finish line of the main event back 1km on the paths around Throsby Bay and back. Parents who have completed in the main event can accompany their kid.