Ok,As Far as guns go(If you get them past customs),NO Unless you have a license,and you cant carry them with you every where you go.At the moment it's winter,so it cold/windy,but plenty of sunshine.During the summer,it'll be hot,and in some parts VERY Humid.You gotta go to taronga zoo,climb the sydney harbour bridge,see uluru,and scuba dive the great barrier reef and go camping on Fraser island!
Where abouts are you staying?