Luggage and bags:
We brought 7 bags between the two of us, but this is only because we are moving for 2 years!
Clothing/Shoes/Weather Gear: I was fine in shorts and short sleeved shirts, however Sarah has had a sweater on for most nights. The weather is beautiful in April!
Toiletries and Medical Supplies: I would probably bring an extra roll of toilet paper with you... its not all that soft round here!
Photo Equipment: I think the photo equipment goes without saying. If you do not take pictures of where you have been, why are you travelling!
Manly never gets too hot or too cold. Summer temperatures range from 25 - 33degrees.
Visiting Sydney in winter shouldn't be much of a problem either. The temperature is often in the high 16-18 and sometimes very low 20's. Don't expect to have to wear much more than a shirt or light jacket.
In the evenings the temperature does drop so a jacket or jumper may be needed.
Toiletries and Medical Supplies:
Sunblock is a must!
Photo Equipment: Bring the camera to take pics of the natural beauty and attractions.
Camping/Beach/Outdoor Gear: Manly has some beautiful beaches so pack swimsuits, towels and beach wear. Flip flops or water shoes.