If you are travelling along the coast with kids then I am going to guess you are going to stop at a beach. We usually find the main beaches to be very busy, especially during school holidays or peak travelling season. Which is why we usually drive around to find a quieter beach within the area.
Although the main beach does have life guards, toilets, showers plus cafes to grab a bite to eat. It is located on the main street in town and has a kids waterpark on the foreshore.