cyling with child in bike trailer region Queensland Australia July-August

We plan to tour 6 weeks with our child (2 years) in bike trailer in the Queensland region Australia. We will arrive by plane in Brisbane in early july, we leave mid august.

We would like to see some wildlife and go snorkling around Great Barrier Reef.

Someone ideas for quiet roads (not too hilly, not too busy car trafic and not too sandy because I will have +25kg on my bike and 30 kg from the child and trailer ).

What about wind directions? f.e. better to travel from south to north or otherwise

Thanks

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