When travelling in Australia especially in Summer, do as the locals do and wear plenty of sunscreen and a hat, at least, it is also a good idea to wear light, long sleeved clothing in the middle of the day.
Making sure you drink plenty of fluids (No, beer doesn't count) especially important on hot summer days.
Australia offers some of the most beautiful and safe beaches in the world, however there are some places where you need to heed the advice of any signs advising that it is NOT safe to swim. These signs are there for good reason and should NEVER be ignored.
Sunburn and dehydration will not make for good memories to take home.