Hmm....compared to Terrigal I would definately go to Byron!
Byron is meant to be the 2nd biggest schoolies desitination and apparantly this year is going to be massive. Its more relaxed less crazy bad stuff and the beaches dont have rubbish everywhere.
Although u might be hard pushed to get...
try www.schoolies.com or www.byron-bayschoolies.com
there are still some apartments available i think and some foresty places in woop woop but hey its still near byron.or you could pitch a tipi on the beach