Most of the beaches down to Byron Bay will be fairly deserted, with congregations at spots like Hastings, where a fickle right and left can form on either side of the point, or Pottsville, where variable sandbars will form along a lonely and sharky stretch of coast. Avoid high tide.
Hastings Point rarely shows it fine potential, but it does suck in available swell and the adjacent beachies might be good. Pottsville is always quiet until the big campsites fill up in summer with holidaymakers. Watch the rips and keep an eye out for dorsal fins.