On Saturday the centres open from 8.30am to 5.30pm, Sundays from 10.30am to 4.30pm. Most boutiques in tourist areas open all day seven days a week. Pub and tavern hours are generally 11am to 11pm. Some stay open considerably later if they provide entertainment, usually on Friday and Saturday nights. The whole of Australia now has common road rules, which are very similar to those in most advanced countries.
Road signs are pretty much the same as well.
The most costly mistake you can make is to drive when you have had too much to drink. All vehicle insurance is void if you have an accident when you are 'over the limit' - .05 in common with most countries which have such limits, less than the .08 in others. If you want to enjoy a very long lunch or a big night out, take a taxi. It's a lot cheaper than paying for a severely battered rental car. Drink driving and or driving under the influence of drugs is considered a crime and you will be arrested and charged.