GO!!!!
I really want to go myself and have been doing loads of research and talking to heaps of people who have been and if it was me I would be heading over in Feb / March for the late season swells on the north side minus the crowds.......still busy but they say lots of spots and most people have had their fill and the pro circus has left town.
I would be making Kilauea volcano park my second highest priority after a few waves on the north shore - good spot for you Aussies as no active Volcanoes here! Sadly