Unfortunately the number of companies which are able to hire out kayaks is limited due to licences and insurance coverage for the Brunswick River.
However, Byron Eco-Cruises and Kayaks still have some kayaks available for hire at around $40-$50 per kayak. Phone Simon and Lorraine on 0410 016 926.
Perhaps take the trip in a paddle boat or row boat?
Brunswick Buccaneer Boat Hire - 0414 300 012