Or you could get a HE car or regular and do about 4 goliath laps roughly 53mins to complete also you will get 4mil credits and about 1mil xp with unbeatable settings
Level up Byron bay to level 5. This unlocks the Goliath Circuit, which is a race around the whole map, a lap takes 8-12 minutes depending on the car/driver. Once you upgrade to level 5 the race will be right on the beach.