Brisbane is one of the safest major cities in Australia, with one of the lowest crime rates in the world.
Both men and women should be able to walk around the CBD (Downtown) at all hours of the night and day and feel perfectly safe. There are no gang and very few violent crime related issues in Brisbane, so there aren't any "no go" areas as such.
There are a few rougher suburbs, but many of these are well out of the city centre (15-20km) and in the poorer outskirts - (Woodridge, Beenleigh, Bracken Ridge, Acacia Ridge etc) so its unlikely many tourists or even long-stay visitors will ever go near them. Even so, many of these neighbourhoods would be considered extraordinarily tame compared to rougher areas overseas.
The only thing you'd need to worry about in Brisbane are late night train rides to outer suburban areas, muggings and such can rarely occur.
Be careful at night on trains. Do not sit in a carriage that does not share a door with the driver. Although new trains are not divided, older trains have two doors between each carriage meaning it will be impossible for anyone to hear you yelling if anything happens.
If you are going to catch the train at night outside of the 3 stations of Roma St, Central, and Brunswick St, I would advise waiting with someone else, in a car close to the station, then moving to the platform when the train is close. A 2 minute announcement will sound. Don't sit alone at a station at night, especially if you are a woman. All stations have camera surveillance, and panic buttons, but these are useless to stop something happening.
Brisbane does not have daylight saving, so remember it will get dark an hour earlier than southern states. When travelling into the suburbs at night, call ahead and ensure a cab or friend is WAITING to pick you up. some stations have taxi ranks, but these may not have cabs right then. Look around at the other people who are getting up to get off at your station. If they scare you, DON'T GET OFF. If you are a woman, and you stand up to get off, and a man/men look like they decided JUST THEN to get off, STAY ON THE TRAIN. Suburban stations are unattended at night.
There are plain clothes transit cops on some trains but not all. AVOID the latest train as this will be full of drunks. There are occasional fights. If you need to wait for the earliest morning train which will have sleepy workers going to work. It gets light at 4:30am in summer.
It's a crime. It's a crime to take photos of kids. Even if it is a normal street scene. Get ready to face being labelled a paedophile and be arrested.
Imagine the jaw dropped in my head....!!!
Don't take me wrong. People who prey on children are SICK and should be rightly condemned and punished.
To the powers that are in the Queensland's Parliament:
Psst! Think: Death penalty. I am egging you on. Come on. Don't disappoint mankind.