I live on the Northern Beaches within walking distance to a beach. Not that I have been much in these last 3 years of La Niña and endless rain. The water temperature might also shock you.
For me , the worst part of living here is the distance from family, friends and places I love in Europe. The price of flying to Europe has almost doubled, especially during the holiday period. The flight is very long so you "waste" days just for the journey. The BA flight leaves Heathrow in the evening, and you arriving at 5 am two days later (as an example leaves on Monday evening, lands on Wednesday morning) . When you go during our winter / Europe's summer, the holidays are short and during our summer, it is winter, people have school, work, it is cold.
I was shocked when Australia closed the borders for leaving Australia. My friend couldn't say goodbye to her dying mum. Her application was denied again and again. She didn't even make it on time for the funeral.
I do not agree on the definition of amazing healthcare system. It is very hard in my council to find a free (bulk billed) GP, to see a free specialist, there is a years-long waiting list, otherwise you pay $280-320 private fee and medicare will give back around 80, so you are out of pocket. The private insurance will NOT cover specialists visits or tests.
I have lived in Sweden and Switzerland and never felt as cold as I have in Sydney, Houses do not have radiators. The houses are heated with electricity or a weird bayonet kind of thing in the wall to which you attach a gas heather ($1000 a piece)
Groceries are quite expensive. I still remember the shock of my first supermarket trip. We eat 99% fresh food, so vegetables, fruits, fish, meat and the fluctuation in price from one week to another is crazy.
I am not into mountain biking or bush walking so can't comment on the outdoor part. The price of shows / theatre is quite high, and the variety of exhibitions quite low.
I find the quality of education, the content of the curriculum, a bit bare compared to the French system I did, so I complement at home, especially on the general knowledge side of thing.
Rent is crazy. Not only the price of housing but the rental market as well. Living on the beaches is very expensive. If you live away from the beaches, you will not go to the beach after school because of the length of the drive, price of parking, and so on. If you live on the beaches, you get a parking sticker.
I was lucky to grow up and live in amazing places in Europe (Monaco, Barcelona, ...) so I don't see Sydney as an upgrade in my life, but as I said, I am not a mountain biking type of girl.
The view is gorgeous, but what makes you feel good wherever you live, is the people , and it is quite hard to make friendships, compared to say Italy.
.... and everyone goes to bed so bloody early!!!!!