OK, don't buy sunscreen in the UK, it's crap. When you get to oz, go to a supermarket and get a litre pump pack of sunscreen and wear it every day, winter and summer. For sport, go for water resistant. I picked up some of this last time I was there,
http://www.cancervic.org.au/store/summer05_sunscreen1/pg_active_sunscreen - it's very good, but a little hard to find. If you are cycling, you want to make sure your sunscreen isn't going to run off your forehead into your eyes.
Oh, and if you have a scottish (or english) accent, red hair and sunburn, expect to be lectured by doctors, pharmacists and strangers on public transport.
Road safety: a bit of both. I just did some googling, and there are more fatalities per head of population than in the UK, but that may be down to the fact that it's easier drive than in the UK (I really don't think Adelaide has a real peak hour), and the distances are much further (ie I expect greater kilometrage per person than in UK). But anyway, you may find this interesting:
http://www.bitre.gov.au/publications/2012/files/RDA_Summary_2011.pdf, check out table 1. Road deaths in Australia in 2011, 1,291 with a population of around 21 million, while
https://www.gov.uk/government/uploa...alties-in-great-britain-main-results-2011.pdf 1,901 with population of 61 million, so that is about double - which is a lot. But they do report every fatality, and often feature them. For instance during Easter, Christmas and on long weekends (==Bank holiday weekends), the fatalities over the holiday period will often lead the news.
http://tinyurl.com/9wwczft.
And check out this:
http://www.theage.com.au/news/national/ipod--the-risks/2006/02/15/1139890771660.html - I bet this fatality did not get as much coverage in London, where it happened.
Don't forget that helmets are compulsory, which means sun protection on a bicycle is a challenge. I used to wear a legionnaire style cover until my partner threatened to leave me.