My honeymoon was in Oz this January, this was my 4th trip since most of my family stay there now. It’s a stunning place, but not somewhere I’d want to go for less than 4 weeks tbh. How long have you got? I’d be wary of trying to do too much just because you think you have to. Just to bring some perspective, would you consider going on honeymoon to France, Spain, Portugal, Italy, Germany and Russia?
This time we went to Tasmania, hired a car and rented 4 separate cottages for a couple of nights each. Magical place, and it has weather 🙂 Such a great mix of mountain wilderness, stunning beaches, ancient forest and old school farming communities, with a bit of culture in Hobart.
I’ve been to Fraser Island, which is stunning. We rented a cottage at the north end of the island so had no electricity apart from the petrol genny. You wife might not appreciate that though!
I like the Blue Mountains and the Lower Hunter Valley for things to do near Sydney. The city itself does nothing for me though. I haven’t visited Melbourne yet but it’s supposed to be interesting. And as above, Wilsons Promontary is well regarded. Perhaps base yourselves around Melbourne and do the Tassie tour? They have a bike park 😉