Eight hours from Sydney and two hours from Brisbane, Byron Bay is one of the most popular surfing and diving holiday destinations in NSW. The township is usually too busy to cycle around, but if you stay close to the waterline you can clock up a nice, although short, ride up to the Lighthouse, all on shared pathways. If you like riding on beaches, there are several access points along the way.
There is a lovely shared coastal path to the Lighthouse, which is about 5 kms out of town. Some of the path goes through rainforest areas, and even during school holidays, there are few people around.
Some of the best views in the Byron region are from the Lighthouse headland. Maybe one day there will be a bike trail that goes off into the horizon.
This short GoPro clip has footage of riding on Byron Beach, a rainforest path, and the ascent to the Lighthouse. The Strava map below shows the route taken.
In summary, a very pretty place but not really offering much cycling infrastructure if your priority is to stay off roads.